Add GitHub Actions workflow for automatic Fly.io deployment

Author: kpython

.github/workflows/deploy.yml .github/workflows/fly.yml.github/workflows/deploy.yml renamed to .github/workflows/fly.yml

@@ -1,19 +1,16 @@
-name: Deploy to Fly.io
-
+name: Fly Deploy
 on:
   push:
     branches:
       - main
-
 jobs:
   deploy:
+    name: Deploy app
     runs-on: ubuntu-latest
+    concurrency: deploy-group
     steps:
       - uses: actions/checkout@v4
-      
-      - name: Deploy to Fly.io
-        uses: superfly/flyctl-actions@master
-        with:
-          args: "deploy"
+      - uses: superfly/flyctl-actions/setup-flyctl@master
+      - run: flyctl deploy --remote-only
         env:
           FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}