feat: add Workshop staging deployment

.github/workflows/workshop.yml

@@ -23,8 +23,9 @@ jobs:
       - run: pnpm install --frozen-lockfile
       - run: pnpm --filter @homarr/workshop typecheck
       - run: pnpm --filter @homarr/docs typecheck
+      - run: docker compose --env-file apps/workshop/.env.staging.example -f apps/workshop/docker-compose.staging.yml config --quiet
       - run: pnpm test:workshop
-      - run: docker build --target production -f apps/workshop/Dockerfile .
+      - run: pnpm test:workshop-image
 
   publish:
     if: github.event_name == 'push' && (github.ref_name == 'v2' || github.ref_name == 'main')