feat: added arm v8 to docker build and push

[JamesMarino]

Added ARM v8 Docker architecture to both build and push scripts.

This has been tested using a personal repo.

[JamesMarino]

Thanks for the review @djfarrelly - what error were you getting when trying to run the build locally? I'm not sure there is anything I needed to do in particular to support linux/arm/v8 on my Mac. I'm able to run the command on Docker Desktop 4.15.0, Engine 20.10.21 and BuildX 0.9.1 and on a MacBook Pro with Intel and Apple Silicon chips.

Addressing the issue higher, how would you feel about running a GitHub Action that would automatically Docker build and push to the maildev/maildev Docker Hub when run on master? This would take out the problem for issues arising when building and pushing multiple platforms on individual devices locally.

[djfarrelly]

Hi @JamesMarino, my Docker for mac gives me these options for buildx:

docker run --privileged --rm tonistiigi/binfmt --install all
{
  "supported": [
    "linux/arm64",
    "linux/amd64",
    "linux/riscv64",
    "linux/ppc64le",
    "linux/s390x",
    "linux/386",
    "linux/mips64le",
    "linux/mips64",
    "linux/arm/v7",
    "linux/arm/v6"
  ],
  "emulators": [
    "qemu-arm",
    "qemu-i386",
    "qemu-mips64",
    "qemu-mips64el",
    "qemu-ppc64le",
    "qemu-riscv64",
    "qemu-s390x",
    "qemu-x86_64"
  ]
}

I would be up for automating pushing to Docker hub, the only challenges are with QA on the image (less needed if there are automated integration tests with the container image. I think the image release can be run on Github actions, but should still be triggered for a particular release tag then just push to "latest" (I've also seen that having version tags on Docker images are best if a regression sneaks into master it might break people's setup). Would you be interested in writing that Github action for this repo?