set dockerfile even if empty string.

.github/workflows/image_app.yml

@@ -68,7 +68,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: apps/${{ inputs.name }}
-          file: apps/${{ inputs.name }}/${{ inputs.dockerfile }}
+          file: apps/${{ inputs.name }}/${{ inputs.dockerfile || 'Dockerfile' }}
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

.github/workflows/image_base.yml

@@ -72,7 +72,7 @@ jobs:
 
       - name: Generate base Dockerfile
         env:
-          RUNTIME_DOCKERFILE: ${{ inputs.dockerfile }}
+          RUNTIME_DOCKERFILE: ${{ inputs.dockerfile || 'Dockerfile' }}
         run: go run docker/main.go -i Dockerfile.tmpl -o Dockerfile -client client/dist
 
       - name: Build and push