Add gitea runner

gitea-runner.yaml

@@ -0,0 +1,12 @@
+services:
+  runner:
+    image: docker.io/gitea/act_runner:latest
+    container_name: gitea-runner
+    restart: unless-stopped
+    environment:
+      GITEA_INSTANCE_URL: https://git.example.com
+      GITEA_RUNNER_REGISTRATION_TOKEN: <TOKEN>
+      GITEA_RUNNER_NAME: <NAME>
+    volumes:
+      - ./gitea-runner/data:/data
+      - /var/run/docker.sock:/var/run/docker.sock