feat: fly.io deployment using CI (#13)

.github/workflows/fly.yml

@@ -0,0 +1,25 @@
+name: Deploy Backend to Fly.io
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get source code
+        uses: actions/checkout@v3
+
+      - name: Deploy to Fly.io
+        uses: superfly/[email protected]
+        env:
+          FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
+        with:
+          args: "deploy --remote-only --dockerfile ./Dockerfile --config ./fly.toml"
+