Update deploy.yml

environment: productionを追加

https://docs.github.com/ja/actions/deployment/targeting-different-environments/using-environments-for-deployment#using-an-environment

.github/workflows/deploy.yml

@@ -6,6 +6,7 @@ on:
 jobs:
   deployment:
     runs-on: ubuntu-latest
+    environment: production
     steps:
     - name: Checkout repository
       uses: actions/checkout@main