ci: remove container override — default runner image already has docker

.gitea/workflows/ci.yml

@@ -58,11 +58,6 @@ jobs:
     runs-on: ubuntu-latest
     # Only run on PRs that touch nomad job specs
     if: github.event_name == 'pull_request'
-    # Use the official Docker CLI image so we get a versioned, maintained docker
-    # binary without hardcoding a static download URL. The runner's docker socket
-    # is already mounted by act_runner, so docker commands work out of the box.
-    container:
-      image: docker:cli
 
     steps:
       - uses: actions/checkout@v4