Add Gitea Actions for automatic deployment

Added workflow to automatically deploy configuration changes when pushing to main branch. Includes comprehensive documentation for setting up SSH keys, configuring secrets, and troubleshooting deployments.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -0,0 +1,27 @@
+name: Deploy Borgmatic Configuration
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    name: Deploy to Production Server
+
+    steps:
+      - name: Deploy via SSH
+        uses: appleboy/ssh-action@v1.0.3
+        with:
+          host: ${{ secrets.SERVER_HOST }}
+          username: ${{ secrets.SERVER_USER }}
+          key: ${{ secrets.SSH_PRIVATE_KEY }}
+          port: ${{ secrets.SSH_PORT || 22 }}
+          script: |
+            cd /opt/borgmatic
+            echo "📥 Pulling latest changes from Git..."
+            git pull origin main
+            echo "🔧 Installing configuration..."
+            make install
+            echo "✅ Deployment completed successfully"