Added env cleanup

Author: taylor-shift

.github/workflows/fly-review.yml

@@ -32,4 +32,11 @@ jobs:
 
       - name: Deploy PR app to Fly.io
         id: deploy
-        uses: superfly/[email protected]
+        uses: superfly/[email protected]
+
+      - name: Clean up preview environment
+        uses: strumwolf/delete-deployment-environment@v2
+        if: ${{ github.event.action == 'closed' }}
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          environment: pr-${{ github.event.number }}