feat: Publish multi-arch docker image (amd64 and arm64)

[project0]

What is the problem I am trying to address?

We want to switch our workload to arm64 (AWS Graviton) for improved cost-efficiency. One of the remaining images not proving arm64 compatible images is athens.

This PR supersede #1794 as the pipeline was moved to github actions

How is the fix applied?

extend github actions workflow

What GitHub issue(s) does this PR fix or close?

Fixes #

[DrPsychick]

@project0 We'll take a look at this after the 0.12.0 version is released.

[mloiseleur]

Hello @DrPsychick ,

0.12.0 version has been released. Is the path clear to review this PR, now ?

[DrPsychick]

Hey @mloiseleur, generally yes, we're on track now again the latest Athens.
Next up will be 0.12.1 with bugfixes (soon). I will take a look at this within the next 2 weeks.

[DrPsychick]

How did you test this?

I cannot get it to run through on my fork, so please test it in your fork so that the actions actually run through.

Also, one minor thing: all other workflows use .yml extension, so keep it consistent please.

https://github.com/DrPsychick/athens/actions/runs/4869859787/jobs/8684877269

[project0]

@DrPsychick i am sorry, i should have tested it better. There seem to be some issues with re-usables here, so i decided to avoid them at the end.

[DrPsychick]

minor fix and we're good I think.

[justenwalker]

Hey @project0 ; thanks for implementing this!

Perhaps we could also get arm64 builds in the .goreleaser.yml as well?

main...justenwalker:athens:jwalker/multi-arch-arm64#diff-42e26dc67aed8aa3edb2472b4403288c1699fb6dc47419b9a475f0f224fe4689

[DrPsychick]

Thank you for your contribution!