add sharding for e2e tests in CI

.github/workflows/playwright.yml

@@ -6,6 +6,11 @@ jobs:
   test:
     runs-on: ubuntu-latest
     timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        shardIndex: [1, 2, 3, 4]
+        shardTotal: [4]
 
     services:
       mailpit:
@@ -67,16 +72,48 @@ jobs:
         run: npx playwright install --with-deps
 
       - name: "Run Playwright tests"
-        run: npx playwright test
+        run: npx playwright test --shard=${{ matrix.shardIndex }}/${{ matrix.shardTotal }}
         env:
           PLAYWRIGHT_BASE_URL: 'http://127.0.0.1:8000'
           MAILPIT_BASE_URL: 'http://localhost:8025'
 
-      - name: "Upload test results"
+      - name: "Upload blob report"
         uses: actions/upload-artifact@v4
         if: always()
         with:
-          name: test-results
-          path: test-results/
-          retention-days: 30
+          name: blob-report-${{ matrix.shardIndex }}
+          path: blob-report/
+          retention-days: 7
 
+  merge-reports:
+    if: always()
+    needs: [test]
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v4
+
+      - name: "Setup node"
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+
+      - name: "Install dependencies"
+        run: npm ci
+
+      - name: "Download blob reports"
+        uses: actions/download-artifact@v4
+        with:
+          path: all-blob-reports
+          pattern: blob-report-*
+          merge-multiple: true
+
+      - name: "Merge reports"
+        run: npx playwright merge-reports --reporter html ./all-blob-reports
+
+      - name: "Upload merged HTML report"
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-report
+          path: playwright-report/
+          retention-days: 30