Add deploy workflow (#66)

.github/workflows/deploy.yaml

@@ -0,0 +1,18 @@
+name: Deploy
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Deploy
+        uses: digitalocean/app_action/deploy@v2
+        with:
+          token: ${{ secrets.DIGITALOCEAN_TOKEN }}