fix build-image

.gitea/workflows/build-image.yaml

@@ -16,9 +16,9 @@ on:
 
 jobs:
   build:
-    # Runs directly on the runner host to access the DinD sidecar
-    # DOCKER_HOST=tcp://localhost:2376 is already set via runner configmap
-    runs-on: docker
+    # Runs in ubuntu-latest container (node:20-bookworm-slim via DinD)
+    # Docker CLI is available via DOCKER_HOST=tcp://localhost:2376 (DinD sidecar)
+    runs-on: ubuntu-latest
 
     steps:
       - name: 🔎 Checkout