ARM64 K8up

[cimnine]

Summary

This has no prio. But I hoped it would be a low hanging fruit.
The aim of this PR is to provide ARM64 binaries and Docker images for K8up.

Todo:

• Build & Push ARM64 release binaries with goreleaser
• Build & Push ARM64 release Docker images with goreleaser
• Enable Github Actions to build multi-arch images
• Build ARM64 snapshot images with make docker-build (see .github/workflows/master.yml)
• Manual Test on ARM64 system
• evtl. automated test on ARM64 system

Checklist

• Keep pull requests small so they can be easily reviewed.
• Categorize the PR by setting a good title and adding one of the labels:
  bug, enhancement, documentation, change, breaking,
  as they show up in the changelog
• Update the documentation.
• Update tests.
• Link this PR to related issues.

[ccremer]

Do we really need ARM for local testing and building and e2e? Why not just build the images with goreleaser upon releases?

[ccremer]

Also, the Dockerfile needs to download the restic binary from GH release page: https://github.com/restic/restic/releases
The images on Docker hub don't seem to feature ARM builds: https://hub.docker.com/r/restic/restic/tags?page=1&ordering=last_updated

Generally I think supporting ARM is on a best-effort basis. I wouldn't yet worry about local builds and tests, just making the images released with goreleaser upon Git pushes would be fine, nothing else.

What do others think @Kidswiss @tobru ?

[cimnine]

Also, the Dockerfile needs to download the restic binary from GH release page: https://github.com/restic/restic/releases
The images on Docker hub don't seem to feature ARM builds: https://hub.docker.com/r/restic/restic/tags?page=1&ordering=last_updated

Good catch! I've opened restic/restic#3516. It would probably not be a huge deal to refactor the restic Dockerfile and Docker image build process to produce ARM64 images.

Generally I think supporting ARM is on a best-effort basis.

Yes.

I wouldn't yet worry about local builds and tests, just making the images released with goreleaser upon Git pushes would be fine, nothing else.

Would be fine by me :)

[tobru]

I think this is a good idea to provide ARM images, this helps people using Raspis and ARM also get's used more and more in the cloud...

[ccremer]

This looks good now 🎉
Would be interesting if that actually works.

@bastjan don't you have an ARM machine where you could quickly test it out?

[cimnine]

I believe make e2e-test K8UP_GOARCH=arm64 should be a pretty complete test, but only works if the Docker server runs on an arm64 host or runs in an arm64 VM.

[bastjan]

@bastjan don't you have an ARM machine where you could quickly test it out?

I do! I'll test it quickly...

[bastjan]

@bastjan don't you have an ARM machine where you could quickly test it out?

I do! I'll test it quickly...

Works on my machine™️