Add a Smoke test workflow

.gitea/workflows/smoke.yml

@@ -0,0 +1,14 @@
+name: smoke
+on:
+  push:
+    branches:
+      - ''         # run on any branch push
+  workflow_dispatch:  # allow manual run from the Actions tab
+jobs:
+  hello:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+          echo "Runner OK on branch: ${GITHUB_REF_NAME}"
+          uname -a