GRO-1939: Add CI smoke test for blackholed migrate runtime

Cherry-picked from fix/GRO-1909-migrate-corepack-offline (f007eca)

.gitea/workflows/ci.yml

@@ -100,7 +100,7 @@ jobs:
           push: true
           tags: |
             git.farh.net/groombook/api:${{ steps.version.outputs.tag }}
-            ${{ github.ref == 'refs/heads/main' && 'git.farh.net/groombook/api:latest' || '' }}
+            ${{ github.ref == 'refs/heads/main' && 'git.farh.net/groombok/api:latest' || '' }}
           cache-from: type=registry,ref=git.farh.net/groombook/cache:api
           cache-to: type=registry,ref=git.farh.net/groombook/cache:api,mode=max
 
@@ -118,6 +118,17 @@ jobs:
           cache-from: type=registry,ref=git.farh.net/groombook/cache:migrate
           cache-to: type=registry,ref=git.farh.net/groombook/cache:migrate,mode=max
 
+      - name: Smoke test migrate image (blackhole npmjs.org)
+        run: |
+          set -euo pipefail
+          IMAGE="git.farh.net/groombook/migrate:${{ steps.version.outputs.tag }}"
+          docker pull "$IMAGE"
+          docker run --rm \
+            --add-host registry.npmjs.org:127.0.0.1 \
+            --entrypoint="" \
+            "$IMAGE" \
+            pnpm --version
+
       - name: Build and push Seed image
         uses: docker/build-push-action@v6
         with: