Setup the Docker GH Action for Matrix Building

[misilot]

This PR enables building of the amd64 and arm64 images simultaneously.

References

Logic borrowed from https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners

Description

Once both images finish, the manifest is sent to Docker Hub, allowing for a single image that has both the amd64/arm64 images.

This will allow for faster building of the amd64 image, and being sent to Docker Hub, while the arm64 image is still being built.

Instructions for Reviewers

Please add a more detailed description of the changes made by your PR. At a minimum, providing a bulleted list of changes in your PR is helpful to reviewers.

List of changes in this PR:

• Creates a matrix for the target arch (amd64, arc64).
• Merges the two docker images and pushes the manifest to Docker Hub at completion

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[tdonohue]

Thanks @misilot ! I found this looks to be borrowed from https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners . I went searching around as I was finding the logic of the "merge" step a bit difficult to follow. But I see that's the recommended approach from Docker themselves.

It's a shame this is so complex to achieve, but I agree that the benefits are wonderful. I'll see if I can get this merged soon so that we can test it out. We'll also need to create a version of this for DSpace/DSpace. I might be able to help with that if I find time (and you don't beat me to it).

[misilot]

@tdonohue yup, I think that is where I borrowed from! It was a while go that I found it.

[tdonohue]

👍 Thanks @misilot ! Looks good and makes sense now that I look at the Docker recommendations (see links above). The only way to fully test it is to merge it. So, I'm going to merge it now. (I was already planning on doing some minor GitHub Actions cleanup tomorrow to prep for 8.0, so this is good timing!)

[dspace-bot]

Successfully created backport PR for dspace-7_x:

• [Port dspace-7_x] Setup the Docker GH Action for Matrix Building #2645

[tdonohue]

Ported to dspace-7_x in #2655