The default atmoz/sftp:alpine Dockerfile needs to be updated to fix the issue when building the image and deploying to Azure Container Instances from Azure DevOps.

The error message after the image has been built and deployed by Azure DevOps:
docker: Error response from daemon: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "/entrypoint": permission denied: unknown.