fixing the browser error while installing WordPress

Author: abhijitb

.github/workflows/playwright-matrix.yml

@@ -226,6 +226,27 @@ jobs:
           npx wp-env run cli wp core version
           echo "WordPress is ready!"
 
+      - name: Drop broken third-party apt repos on the runner
+        run: |
+          # `playwright install --with-deps` runs apt-get update on the RUNNER
+          # itself (not inside the wp-env container). GitHub's image ships
+          # third-party apt sources, and Google's has been serving a
+          # Packages.gz whose checksum does not match its own Release file:
+          #   E: Failed to fetch .../Packages.gz  Hash Sum mismatch
+          # apt fails the whole update on one bad repo, which takes this step
+          # down on every matrix leg. Playwright's OS dependencies come from
+          # Ubuntu's own repos, so these third-party sources are unnecessary
+          # here and safe to remove. Retrying does not help - the bad index is
+          # served from Google's CDN, not cached locally.
+          # Match on content, not filename: the runner image has used more
+          # than one name/URL form for this source. Scoped to sources.list.d so
+          # /etc/apt/sources.list (Ubuntu's own repos) can never be removed.
+          sudo grep -rl 'dl\.google\.com' /etc/apt/sources.list.d/ 2>/dev/null \
+            | sudo xargs -r rm -fv || true
+          sudo apt-get clean
+          sudo rm -rf /var/lib/apt/lists/*
+          sudo apt-get update
+
       - name: Install Playwright Browsers
         run: npx playwright install --with-deps chromium