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docs: add CI cache configuration audit report
Agent-Logs-Url: https://github.com/objectstack-ai/objectui/sessions/bb8d201b-62ea-48f6-997e-339b081d66b6 Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
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‎.github/CI_CACHE_AUDIT.md‎

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# CI Cache Configuration Audit Report
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**Date:** 2026-04-13
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**Repository:** objectstack-ai/objectui
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**Branch:** claude/check-ci-cache-processes
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## Executive Summary
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This report documents a comprehensive audit of all GitHub Actions workflow cache configurations. The audit identified and fixed several missing cache configurations that were impacting CI performance.
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### Key Findings
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- ✅ **pnpm-lock.yaml:** Valid and healthy (lockfile version 9.0, 46 importers)
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- ❌ **Missing Turbo caches:** 2 jobs were missing Turbo cache configuration
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- ❌ **Missing Playwright caches:** 2 jobs were installing browsers from scratch every time
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- ✅ **pnpm version:** Consistently set to 10.31.0 across all workflows
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- ✅ **Cache keys:** Properly scoped and consistent
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## Issues Fixed
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### 1. ci.yml - Test Job
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**Problem:** Missing Turbo cache
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**Impact:** Tests ran without build cache, slowing down test execution
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**Fix:** Added Turbo cache configuration with proper keys
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### 2. ci.yml - E2E Job
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**Problem:** Missing both Turbo cache and Playwright browser cache
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**Impact:**
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- No build cache for E2E tests
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- Playwright browsers (~200MB) downloaded and installed every run
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**Fix:**
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- Added Turbo cache configuration
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- Added Playwright browser cache with version-based key
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- Optimized installation steps to skip browser download when cached
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### 3. storybook-tests.yml
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**Problem:** Missing Playwright browser cache
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**Impact:** Playwright browsers downloaded every run
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**Fix:**
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- Added Playwright browser cache with version-based key
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- Optimized installation with conditional steps
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## Cache Configuration Details
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### Turbo Cache
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**Purpose:** Caches build outputs and computation results
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**Path:** `node_modules/.cache/turbo`
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**Key Strategy:**
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- Primary key: `turbo-${{ runner.os }}-${{ github.sha }}`
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- Restore keys: `turbo-${{ runner.os }}-`
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**Workflows Using Turbo Cache:**
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- ✅ ci.yml (test, build, e2e, docs)
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- ✅ lint.yml
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- ✅ storybook-deploy.yml
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- ✅ release.yml
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- ✅ performance-budget.yml
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- ✅ storybook-tests.yml
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- ✅ changeset-release.yml
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### pnpm Cache
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**Purpose:** Caches npm packages
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**Implementation:** Built into `setup-node` action with `cache: 'pnpm'`
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**Path:** `~/.pnpm-store` (managed by action)
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**All workflows properly configured with pnpm cache** ✅
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### Playwright Browser Cache
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**Purpose:** Caches installed browser binaries
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**Path:** `~/.cache/ms-playwright`
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**Key Strategy:** `playwright-${{ runner.os }}-${{ version }}`
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**Implementation Details:**
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```yaml
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- name: Get Playwright version
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id: playwright-version
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run: echo "version=$(pnpm list @playwright/test --depth=0 --json | jq -r '.[0].devDependencies["@playwright/test"].version')" >> $GITHUB_OUTPUT
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- name: Cache Playwright browsers
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uses: actions/cache@v5
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id: playwright-cache
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with:
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path: ~/.cache/ms-playwright
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key: playwright-${{ runner.os }}-${{ steps.playwright-version.outputs.version }}
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- name: Install Playwright browsers
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if: steps.playwright-cache.outputs.cache-hit != 'true'
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run: pnpm exec playwright install --with-deps chromium
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- name: Install Playwright system dependencies
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if: steps.playwright-cache.outputs.cache-hit == 'true'
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run: pnpm exec playwright install-deps chromium
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```
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**Workflows Using Playwright Cache:**
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- ✅ ci.yml (e2e job)
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- ✅ storybook-tests.yml
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## Performance Impact
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### Before Optimization
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- Test job: No build cache
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- E2E job: No build cache + ~200MB browser download every run
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- Storybook tests: ~200MB browser download every run
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### After Optimization
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- Test job: Turbo cache enables incremental builds/tests
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- E2E job: Build cache + browser cache (browser download only on version change)
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- Storybook tests: Browser cache (browser download only on version change)
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**Estimated Time Savings:**
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- Browser downloads: ~2-3 minutes per workflow run (when cached)
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- Build cache: Variable, depends on changes (typically 30s-2min)
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## Lockfile Health Check
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```
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✅ pnpm-lock.yaml is valid YAML
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✅ Lockfile version: 9.0
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✅ Total importers: 46
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✅ No YAML document separator issues
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✅ No corruption detected
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```
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**Note on Error in Problem Statement:**
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The error mentioned in the original issue appears to have been a transient problem, possibly caused by:
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- Concurrent git operations creating a temporary conflict
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- Network interruption during a previous workflow run
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- Manual editing that was later corrected
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The current lockfile is completely valid.
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## Workflows Not Requiring Additional Caching
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### shadcn-check.yml
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- Only runs analysis commands
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- No build/test operations
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- pnpm cache sufficient
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### dependabot-auto-merge.yml
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- Only validates and approves PRs
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- No build operations
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- pnpm cache sufficient
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### changelog.yml, labeler.yml, check-links.yml, stale.yml
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- Non-build workflows
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- Don't require build caching
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## Best Practices Implemented
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1. **Consistent pnpm version** (10.31.0) across all workflows
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2. **Turbo cache** for all build/test jobs
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3. **Playwright cache** version-scoped to avoid stale browsers
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4. **Conditional installation** to skip downloads when cached
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5. **System dependencies** installed separately when using cached browsers
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6. **Cache keys** properly scoped by OS and version/SHA
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## Recommendations for Future
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1. **Monitor cache hit rates** in GitHub Actions to ensure caches are being used effectively
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2. **Consider adding cache size limits** to prevent excessive storage usage
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3. **Review cache strategy** if Playwright version changes frequently
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4. **Document cache invalidation strategy** for major dependency updates
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## Files Modified
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- `.github/workflows/ci.yml`
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- Added Turbo cache to test job
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- Added Turbo cache to e2e job
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- Added Playwright cache to e2e job with conditional installation
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- `.github/workflows/storybook-tests.yml`
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- Added Playwright cache with conditional installation
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## Validation
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All changes follow GitHub Actions best practices:
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- ✅ Cache paths are correct for each tool
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- ✅ Cache keys include appropriate scope (OS, version, SHA)
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- ✅ Restore keys allow fallback to previous caches
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- ✅ Conditional steps prevent unnecessary operations
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- ✅ All workflows maintain pnpm version consistency
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## Conclusion
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The audit successfully identified and resolved cache configuration gaps in the CI pipeline. The improvements will:
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- Reduce CI execution time
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- Lower bandwidth usage
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- Improve developer experience with faster feedback
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- Maintain consistent caching strategy across all workflows
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No issues were found with pnpm-lock.yaml - it is valid and healthy.

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