build: add testing proxy to playwright CI

This PR switches the playwright test in CI to use the consoledot testing
proxy instead of the development one in fec. This should result in
faster and more stable tests.

.github/workflows/playwright.yml

@@ -31,7 +31,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: 20
-          cache: 'npm'
+          cache: "npm"
 
       - name: Install front-end dependencies
         run: npm ci
@@ -48,8 +48,11 @@ jobs:
 
       - name: Start front-end server
         run: |
-          npm run start:stage &
-          npx wait-on https://localhost:1337
+          npm run start:federated &
+          npx wait-on http://localhost:8003/apps/image-builder/
+
+      - name: Run testing proxy
+        run: docker run -d --network=host -e HTTPS_PROXY=$RH_PROXY_URL -v "$(pwd)/config:/config:ro,Z" --name consoledot-testing-proxy quay.io/dvagner/consoledot-testing-proxy
 
       - name: Run front-end Playwright tests
         env: