add deploy action

.gitea/workflows/deploy.yaml

@@ -0,0 +1,17 @@
+name: Deploy Bookshelf
+on:
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build & deploy
+        run: |
+          git pull
+          docker compose up -d --build