Keep container verification focused on runtime behavior

.github/workflows/container.yml

@@ -25,7 +25,7 @@ jobs:
           cache: npm
       - run: npm ci
       - uses: docker/setup-buildx-action@v3
-      - name: Build and run offline checks
+      - name: Build container
         uses: docker/build-push-action@v6
         with:
           context: .