demo: gitea actions PoC

.gitea/workflows/demo.yml

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+name: Demo
+on: [push]
+
+jobs:
+  hello:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: System info
+        run: |
+          echo "Hello from Gitea Actions on OKE"
+          uname -a
+
+      - name: Run app
+        run: python3 app.py

README.md

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+# Gitea Actions demo
+
+A minimal repository that runs a Gitea Actions workflow on the in-cluster runner.
+
+## Prerequisites
+
+- Gitea deployed and reachable (VPN required): `https://gitea.stg.dadosfera.ai`
+- The act_runner registered and **Idle** (Site Administration → Actions → Runners) — see the root README runbook.
+
+## Walkthrough
+
+1. Log in at `https://gitea.stg.dadosfera.ai` with the admin credentials from AWS Secrets Manager (`stg/gitea/admin`).
+
+2. Create a repository, e.g. `demo` (under your user or a new org). Leave "Initialize repository" unchecked.
+
+3. Push this directory's content to it (HTTPS only — SSH is disabled on this instance):
+
+   ```bash
+   cd examples/demo-repo
+   git init -b main
+   git add .
+   git commit -m "demo"
+   git remote add gitea https://gitea.stg.dadosfera.ai/<owner>/demo.git
+   git push gitea main
+   # authenticate with the admin username + password, or an application token
+   # (Settings → Applications → Generate New Token)
+   ```
+
+4. Open the repo's **Actions** tab in Gitea. The `Demo` workflow should be running; it checks out the code, prints system info, and runs `app.py`. Green check = the PoC loop is closed.
+
+## How it resolves
+
+- `runs-on: ubuntu-latest` maps to the runner label `ubuntu-latest:docker://gitea/runner-images:ubuntu-latest` — the job runs in that image inside the runner pod's docker-in-docker sidecar.
+- `actions/checkout@v4` is fetched from GitHub because the instance sets `DEFAULT_ACTIONS_URL: github` (cluster nodes need outbound internet).

app.py

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+print("gitea actions demo ok")