ci: run jon in container with Node + Docker cli

.gitea/workflows/backend-docker.yml

@@ -13,7 +13,11 @@ on:
 
 jobs:
   docker:
-    runs-on: ubuntu-latest
+    # Match your current runner label and provide a container with Node + Docker CLI
+    runs-on: [self-hosted, docker]
+    container:
+      image: ghcr.io/catthehacker/ubuntu:act-latest
+      options: --privileged -v /var/run/docker.sock:/var/run/docker.sock
     steps:
       - name: Checkout
         uses: actions/checkout@v3