Use Dockerfile.prod in Build action

.github/workflows/build.yml

@@ -43,7 +43,7 @@ jobs:
               uses: hathitrust/github_actions/[email protected]
               with:
                 image: ghcr.io/${{ github.repository }}-unstable
-                dockerfile: Dockerfile
+                dockerfile: Dockerfile.prod
                 img_tag: ${{ inputs.img_tag }}
                 tag: ${{ inputs.ref }}
                 push_latest: ${{ inputs.push_latest}}