Add Go demo with isolated CI and manual production release

.gitea/workflows/ci.yaml

@@ -0,0 +1,22 @@
+name: Demo CI
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+concurrency:
+  group: demo-cicd
+  cancel-in-progress: false
+jobs:
+  check:
+    runs-on: demo-build
+    timeout-minutes: 30
+    services:
+      buildkit:
+        image: mirror.gcr.io/moby/buildkit@sha256:f8a833b2de9d68e27f0815e4a737abdfaf8a2e4c615650557df11025101557b4
+    steps:
+      - name: Clean checkout and isolated Go checks
+        env:
+          GITEA_TOKEN: ${{ gitea.token }}
+          GITEA_REPOSITORY: ${{ gitea.repository }}
+          SOURCE_SHA: ${{ gitea.sha }}
+        run: python3 /opt/ci/pipeline.py check