feat: add Gitea runner installation scripts

- Add automated installation script for Gitea Act Runner
- Add docker-compose configuration for easy runner deployment
- Support both Docker and binary installation methods
- Include systemd service setup for Linux

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.runner.yml

@@ -0,0 +1,30 @@
+version: '3.8'
+
+services:
+  gitea-runner:
+    image: gitea/act_runner:latest
+    container_name: gitea-runner-picpeak
+    restart: unless-stopped
+    environment:
+      # IMPORTANT: Replace this with your actual registration token from Gitea
+      - GITEA_RUNNER_REGISTRATION_TOKEN=YOUR_REGISTRATION_TOKEN_HERE
+      - GITEA_INSTANCE_URL=https://gitea.nothaft.cloud
+      - GITEA_RUNNER_NAME=picpeak-docker-runner
+      # Runner labels - what this runner can handle
+      - GITEA_RUNNER_LABELS=ubuntu-latest:docker://node:16-bullseye,ubuntu-22.04:docker://node:16-bullseye,ubuntu-20.04:docker://node:16-bullseye
+    volumes:
+      # Mount Docker socket to allow runner to create containers
+      - /var/run/docker.sock:/var/run/docker.sock
+      # Persist runner data
+      - ./runner-data:/data
+      # Cache directory
+      - ./runner-cache:/root/.cache
+    # Optional: Use host network for better performance
+    # network_mode: host
+    
+  # Optional: Watchtower to auto-update the runner
+  # watchtower:
+  #   image: containrrr/watchtower
+  #   volumes:
+  #     - /var/run/docker.sock:/var/run/docker.sock
+  #   command: --interval 86400 gitea-runner-picpeak