Too many vendors do not implement the container spec correctly for multi-arch images

[nigelgbanks]

I've run into several issues with different tools AWS, GitLab, etc. Where they don't properly respect the manifest for V2 registries that make use of the multi-arch features. Despite the feature existing for many years, and claiming they support it the spec in their docs.

Most recent issue I've encountered:

• https://gitlab.com/gitlab-org/gitlab/-/issues/325669

A potential workaround is to add additional tags to the images, so one could do something like:

docker pull islandora/drupal:1.0.7-arm64 or docker pull islandora/drupal:1.0.7-amd64

In addition to the multi-arch images, we are already producing.

This way, some services could refer to the explicit tags if they don't implement the spec correctly.

[nigelgbanks]

Might be a bit of a pain, as the system is currently rigged up to generate manifests for both images as built, might inadvertently increase build times by a few mins.

[g7morris]

@nigelgbanks Do you want to schedule a Zoom call re this task or talk in Slack sometime this week to divvy up next steps between the two of us?

[nigelgbanks]

Done under #238