feat: split CI/CD workflow into parallel jobs for faster execution

Split the single ci-cd job into two parallel jobs:
- test: Lint + Unit Tests (runs on PR/feature branches only)
- build-and-deploy: Build + Integration Tests + Deploy (always runs)

Changes:
- Added job-level `if` condition for test job
- Renamed artifact names to avoid conflicts:
  - test-output-unit (from test job)
  - test-output-integration (from build-and-deploy job)

Expected benefit: Reduced CI execution time through parallel execution.

Fixes #519

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: takaokouji

.github/workflows/ci-cd.yml

@@ -16,10 +16,15 @@ permissions:
     pull-requests: write # comment on released pull requests
 
 jobs:
-    ci-cd:
+    test:
         runs-on: ubuntu-latest
+        if: |
+            (!(
+              github.ref == 'refs/heads/develop' ||
+              github.ref == 'refs/heads/master' ||
+              github.ref == 'refs/heads/main'
+            ))
         env:
-            DETECT_CHROMEDRIVER_VERSION: "true"
             JEST_JUNIT_OUTPUT_DIR: test-results
             NODE_OPTIONS: --max-old-space-size=4000
         steps:
@@ -41,24 +46,43 @@ jobs:
             - name: Build scratch-vm for smalruby
               run: npm run setup-scratch-vm
             - name: Lint
-              if: |
-                (!(
-                  github.ref == 'refs/heads/develop' ||
-                  github.ref == 'refs/heads/master' ||
-                  github.ref == 'refs/heads/main'
-                ))
               run: npm run test:lint
             - name: Run Unit Tests
-              if: |
-                (!(
-                  github.ref == 'refs/heads/develop' ||
-                  github.ref == 'refs/heads/master' ||
-                  github.ref == 'refs/heads/main'
-                ))
               env:
                   JEST_JUNIT_OUTPUT_NAME: unit-results.xml
                   JEST_JUNIT_OUTPUT_DIR: test-results/unit
               run: npm run test:unit -- --reporters="default" --reporters="jest-junit" --coverage --coverageReporters=text --coverageReporters=lcov --maxWorkers="2"
+            - name: Store Test Results
+              if: always() # Even if tests fail
+              uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4
+              with:
+                name: test-output-unit
+                path: ./test-results/*
+
+    build-and-deploy:
+        runs-on: ubuntu-latest
+        env:
+            DETECT_CHROMEDRIVER_VERSION: "true"
+            JEST_JUNIT_OUTPUT_DIR: test-results
+            NODE_OPTIONS: --max-old-space-size=4000
+        steps:
+            - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+            - uses: actions/setup-node@26961cf329f22f6837d5f54c3efd76b480300ace # v4
+              with:
+                  cache: "npm"
+                  node-version-file: ".nvmrc"
+            - name: Info
+              run: |
+                  cat <<EOF
+                  Node version: $(node --version)
+                  NPM version: $(npm --version)
+                  GitHub ref: ${{ github.ref }}
+                  GitHub head ref: ${{ github.head_ref }}
+                  EOF
+            - name: Install Dependencies
+              run: npm ci
+            - name: Build scratch-vm for smalruby
+              run: npm run setup-scratch-vm
             - name: Run Build
               env:
                 NODE_OPTIONS: --max-old-space-size=4000
@@ -105,8 +129,8 @@ jobs:
               if: always() # Even if tests fail
               uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4
               with:
-                name: test-output
-                path: ./test-results/* # Both unit and integration test results
+                name: test-output-integration
+                path: ./test-results/*
             - run: |
                 if [[ ${{ contains(github.ref, 'hotfix') }} == 'true' ]]; then
                 sed -e "s|hotfix/REPLACE|${{ github.ref_name }}|" --in-place release.config.js