feat(build): setup multiarch build for arm64

[Darkbladecr]

According to issue #1160 #1138

I do not know what the CI environment is for building the docker images. But I have updated the Dockerfile to be able to accommodate multiarch builds. Note my environment is arm64 so I have to set up the docker for amd64, the converse may be true for your build CI environment.

As per the multi_arch script the docker buildx environment needs to be setup:

docker context create container
docker buildx create --use container

I assume the CI is a linux environment in which case buildx needs to be installed: https://github.com/docker/buildx?tab=readme-ov-file#linux-packages

[CLAassistant]

All committers have signed the CLA.

[mofirouz]

Thanks for this. Do you have a way to update the build README for binary releases too?

[Darkbladecr]

Thanks for this. Do you have a way to update the build README for binary releases too?

I haven't touched the binary workflow, so they should work as setup previously. I wanted to try and avoid any breaks with existing code or CI/CD. If you want me to clean everything up so that it works with this single Dockerfile, and update the readme for how to run it for any platform with docker buildx I can do that?

[Darkbladecr]

Removed duplicate docker builds for both the main server and the pluginbuilder
Added info on how to use/setup in the README.md

Updated the scripts to automatically pull the latest tag and info:

VER="$(git tag -l --sort=-creatordate | head -n 1)"
DOCKER_VER=heroiclabs/nakama:${VER:1}
echo Building $DOCKER_VER
docker buildx build --platform linux/amd64,linux/arm64 \
  --builder=container \
  --build-arg repo=https://github.com/heroiclabs/nakama.git \
  --build-arg commit="$(git rev-parse --short HEAD)" \
  --build-arg version=$VER \
  --tag $DOCKER_VER \
  --push .

Note the --build-arg repo is not required there is a default, but I realized as I was trying this out on my fork the build was failing as it could not find the latest commit for checkout. So this is now an optional argument that can be passed for development on forks.

[Darkbladecr]

Anything else that needs to be done here @mofirouz ?
Do I need to create an implementation on CI with github actions?