fix(e2e): making required action cacheable

Author: edelauna

.github/workflows/e2e.yml

@@ -4,15 +4,6 @@ on:
     workflow_dispatch:
     pull_request:
         types: [opened, reopened, ready_for_review, synchronize]
-        paths:
-            - "src/**"
-            - "webview-ui/**"
-            - "apps/vscode-e2e/**"
-            - "packages/core/**"
-            - "package.json"
-            - "pnpm-lock.yaml"
-            - "turbo.json"
-            - ".github/actions/setup-node-pnpm/**"
     merge_group:
         types: [checks_requested]
 
@@ -23,9 +14,40 @@ jobs:
         steps:
             - name: Checkout code
               uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+
+            - name: Restore mocked E2E pass marker
+              id: e2e-marker
+              uses: actions/cache/restore@v4
+              with:
+                  path: .cache/e2e-pass
+                  # packages/** is intentionally broader than the old packages/core/** to avoid false cache hits when any package changes
+                  # base_ref is included to prevent same-repo branches from stuffing a pass marker for a different base
+                  key: ${{ runner.os }}-mocked-e2e-${{ github.base_ref }}-${{ hashFiles('src/**', 'webview-ui/**', 'apps/vscode-e2e/**', 'packages/**', 'package.json', 'pnpm-lock.yaml', 'pnpm-workspace.yaml', 'turbo.json', '.github/workflows/e2e.yml', '.github/actions/setup-node-pnpm/**') }}
+
+            - name: Use cached mocked E2E result
+              if: github.event_name == 'pull_request' && steps.e2e-marker.outputs.cache-hit == 'true'
+              run: echo "Skipping mocked E2E tests because this source hash already passed."
+
             - name: Setup Node.js and pnpm
+              if: github.event_name != 'pull_request' || steps.e2e-marker.outputs.cache-hit != 'true'
               uses: ./.github/actions/setup-node-pnpm
             - name: Install xvfb
+              if: github.event_name != 'pull_request' || steps.e2e-marker.outputs.cache-hit != 'true'
               run: sudo apt-get install -y xvfb
             - name: Run mocked E2E tests
+              id: run-e2e
+              # merge_group and workflow_dispatch always run; cache skip is pull_request only
+              if: github.event_name != 'pull_request' || steps.e2e-marker.outputs.cache-hit != 'true'
               run: xvfb-run -a pnpm --filter @roo-code/vscode-e2e test:ci:mock
+
+            - name: Write mocked E2E pass marker
+              if: steps.e2e-marker.outputs.cache-hit != 'true' && steps.run-e2e.outcome == 'success'
+              run: mkdir -p .cache/e2e-pass && date -u > .cache/e2e-pass/passed
+
+            - name: Save mocked E2E pass marker
+              if: steps.e2e-marker.outputs.cache-hit != 'true' && steps.run-e2e.outcome == 'success'
+              continue-on-error: true
+              uses: actions/cache/save@v4
+              with:
+                  path: .cache/e2e-pass
+                  key: ${{ steps.e2e-marker.outputs.cache-primary-key }}