feat: add multiarch docker build support

[Thunderbottom]

• Added docker build support for the following platforms:
  • amd64 (default)
  • arm64v8
  • armv6
  • armv7
• Added GOOS and GOARCH information to the buildString
• Added docker manifest details to store image architecture metadata
• Updated docker/login-action from v1 to v2
• Updated goreleaser/goreleaser-action from v2 to v4

Tested the images locally, built with goreleaser and seems to be working fine. Screenshots:

Build Images

Running Containers

Container Binary Build Info

[activenode]

This is desperately needed :)

Thanks for the PR. Wanted to do the exact same thing <3

Can we have this merged soon?

[knadh]

Done. Thanks @Thunderbottom!

[activenode]

Neat. One quick question. I am not seeing auto-releases for main pushes. Only for v* tags. So do you have in mind when to push the next tag so that it gets pushed to DockerHub? :)

Thanks a bunch @knadh for this great piece.

[knadh]

Hi @activenode. I don't think it's ideal for the entire package to be built and pushed on every commit, where some commits may be trivial. A better approach would be to have an automated monthly RC release or something along those lines.

[activenode]

Sure that's fine. I just wanted to ask basically when the next version release is expected. Until then I can build it on my own, all good

[dandry]

Adding to what @activenode asked. @knadh is there any schedule for the release? I am so eager to try listmonk on my ARM VPS. Great project by the way. Thank you all for contributing to it.

[activenode]

@dandry I created an arm64 build because I wouldn't want to wait. If you wanna try it. It's the exact latest version. https://hub.docker.com/repository/docker/activenode/listmonk-arm64/tags?page=1&ordering=last_updated

[dandry]

@activenode thank you, will give it a try!

[activenode]

Coming back to this thread, I was forking the newest main and seeing that goreleaser wouldn't do all the builds now as it fails with darwin and windows . Which is totally okay because who wants that anyway :D buuuut it breaks the build really.

I'm working on that in my fork and will provide a PR back.

[activenode]

Little Update:

I'm still working on my branch, multiple errors occur of which one is that syscall.Utsname isn't available on all platforms. I am trying to find a more fitting/generic solution

[activenode]

#1414

(also @dandry I have now recreated all builds until my new PR is properly merged so feel free to use https://hub.docker.com/r/activenode/listmonk/tags)