ci(e2e): trust the checkout in the WebKit container; measure the day button once it settles

.github/workflows/e2e.yml

@@ -180,11 +180,14 @@ jobs:
       AUTH_RP_ORIGIN: http://localhost:3000
       SESSION_COOKIE_SECURE: "false"
       NODE_ENV: production
-      HOME: /root
 
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
+      # The image runs as root while the checkout belongs to the runner user;
+      # git refuses such a tree, and the prepare hook calls git.
+      - run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
+
       - uses: pnpm/action-setup@ea17c68df8912ef543352723c149a84f56e3d413 # v6.1.0
 
       - uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0