fix(ci): use localhost instead of host.docker.internal for Playwright

host.docker.internal is a Docker Desktop feature unavailable on Gitea Actions
ubuntu-latest runners. Linux runners can reach the Docker Compose service
via localhost when using docker compose expose/published ports.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -82,7 +82,7 @@ jobs:
       - name: Run E2E tests
         run: pnpm --filter @groombook/e2e test
         env:
-          PLAYWRIGHT_BASE_URL: http://host.docker.internal:8080
+          PLAYWRIGHT_BASE_URL: http://localhost:8080
 
       - name: Stop Docker Compose stack
         if: always()