fix(docker): repair build

.gitea/workflows/build.yml

@@ -24,6 +24,16 @@ jobs:
           username: ${{ secrets.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
 
+      - name: Test runtime
+        run: |
+          docker build --target build -t debug-build .
+          docker run --rm -d -p 3000:3000 --name test-app debug-build sh -c "cd /app && npx nuxt dev --host 0.0.0.0"
+          sleep 15
+          curl -s http://localhost:3000 || true
+          curl -s http://localhost:3000/gallery || true
+          docker logs test-app
+          docker stop test-app
+
       - name: Build and push Docker image
         run: |
           docker build -t git.pihkaal.me/pihkaal/pihkaal-me:latest .