add sample actions workflow

.gitea/workflows/sample.yml

@@ -0,0 +1,12 @@
+name: Test Gitea Actions
+on: [push]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: List files
+        run: ls -la
+      - name: Done
+        run: echo "Gitea Actions working on 1.25.5!"