Update staging.yml

Author: dohyun06

.github/workflows/staging.yml

@@ -7,6 +7,7 @@ on:
       - prisma/schema.prisma
     branches:
       - main
+  workflow_dispatch:
 
 env:
   REGISTRY: ghcr.io
@@ -52,7 +53,6 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          file: ./apps/api/Dockerfile
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}