quay.io images are in the deprecated (unsupported) Docker Image format v1

[mr-c]

1.0.4: Pulling from briandoconnor/dockstore-tool-md5sum
[DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release. Suggest the author of quay.io/briandoconnor/dockstore-tool-md5sum:1.0.4 to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/

@briandoconnor Can you initiate a new build, perhaps tagged 1.0.5?

As a work around, I've forked this repo and made a matching quay.io repository with OCI builds for all tags at https://quay.io/repository/mr_c/dockstore-tool-md5sum?tab=tags ; so anyone else running into this can change their quay.io/briandoconnor/dockstore-tool-md5sum references to quay.io/mr_c/dockstore-tool-md5sum

However my new images are not identical in content to the original, as the base container ubuntu:16.04 was changing over time while the original container images were built. I don't think it will matter, though.