ci: fix runner image (node:20), add Playwright smoke tests

- Change runner to node:20 (has bash) instead of node:20-alpine
- Add tests/smoke.spec.js: 7 tests covering title, welcome screen,
  COMARCA_PATHS count (43), Lluçanès/Moianès presence, and
  filter counts (coastal=12, interior=21, mountain=10)
- Add playwright.config.js
- Fix CI workflow: use 'serve' for static server, proper SSH key setup

.gitea/workflows/ci.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   # ─────────────────────────────────────────────
-  # JOB 1: Playwright tests
+  # JOB 1: Playwright smoke tests
   # ─────────────────────────────────────────────
   test:
     name: Playwright tests
@@ -19,21 +19,19 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
 
       - name: Install dependencies
-        run: npm ci --omit=dev
+        run: npm ci
 
-      - name: Install Playwright browsers
+      - name: Install Playwright + Chromium system deps
         run: npx playwright install chromium --with-deps
 
-      - name: Start app (static HTTP server)
+      - name: Start static HTTP server
         run: |
-          npm install --save-dev http-server
-          npx http-server . -p 9090 &
-          sleep 2
+          npx --yes serve . -l 9090 &
+          sleep 3
 
-      - name: Run Playwright tests
+      - name: Run smoke tests
         run: npx playwright test --reporter=list
         env:
           APP_URL: http://localhost:9090
@@ -52,9 +50,11 @@ jobs:
       - name: Setup SSH key
         run: |
           mkdir -p ~/.ssh
-          echo "${{ secrets.VPS_SSH_KEY }}" > ~/.ssh/id_ed25519
+          printf '%s\n' "$VPS_SSH_KEY" > ~/.ssh/id_ed25519
           chmod 600 ~/.ssh/id_ed25519
           ssh-keyscan -H 80.225.185.50 >> ~/.ssh/known_hosts
+        env:
+          VPS_SSH_KEY: ${{ secrets.VPS_SSH_KEY }}
 
       - name: Upload static files
         run: |
@@ -63,15 +63,16 @@ jobs:
 
       - name: Upload server files & rebuild
         run: |
-          ssh -i ~/.ssh/id_ed25519 ubuntu@80.225.185.50 "mkdir -p /srv/docker/builds/comarques"
           scp -i ~/.ssh/id_ed25519 server.js package.json Dockerfile \
             ubuntu@80.225.185.50:/srv/docker/builds/comarques/
           ssh -i ~/.ssh/id_ed25519 ubuntu@80.225.185.50 \
-            "cd /srv/docker/builds/comarques && docker build -t comarques-de-catalunya:latest . \
-             && cd /srv/docker/compose && docker compose up -d comarques"
+            "cd /srv/docker/builds/comarques \
+             && docker build -t comarques-de-catalunya:latest . \
+             && cd /srv/docker/compose \
+             && docker compose up -d comarques"
 
       - name: Health check
         run: |
           sleep 5
           curl -fs https://comarques.jaumegar.work/api/health \
-            || (echo "❌ Health check failed after deploy" && exit 1)
+            || (echo "Health check failed" && exit 1)