Integrate aarch64 into the building /release process

[beta-ziliani]

Right now aarc64 tasks are run by CI, but they aren't really part of the build process.

• create musl images Create aarch64-musl docker images #123
• create gnu images Create aarch64 gnu docker images #124
  (WIP)

[straight-shoota]

It seems like circli has arm support now: https://circleci.com/build-environments/arm/
That should make this easier.

[jhass]

What was the reason again that we keep circle around for only the release builds?

Anyhow, not that setting up a self hosted runner for it on our build machine should be too difficult https://circleci.com/docs/2.0/runner-overview/

[beta-ziliani]

Unfortunately we can't run self-hosted runners on Circle CI. About why use Circle CI only for release builds is merely a matter of balancing the workload.

[stakach]

84codes provides a range of multi-arch images
https://hub.docker.com/r/84codes/crystal/tags

They also have multi-arch packages for most linux distros
https://github.com/84codes/crystal-container-images
So you can easily add the deb package and install crystal on a raspberry pi for example

[bendangelo]

Hi, I'm having some issues using 84codes crystal base images (because they have arm64 versions).

Edit: For get that comment, the 84codes images entrypoint is different from the crystal base image. I've fixed the issue on my end.

[mloughran]

I settled on using alpine's crystal binaries, and have had no issues whatsoever (having also had some different issues with the 84codes images).

Our Dockerfile looks like this, but you could simplify (and remove static build dependencies) if you don't care about having a separate build container, or use alpine:edge if you'd rather use the latest crystal than an alpine release branch (see packages):

FROM alpine:3.19 as build
RUN apk add crystal shards
RUN apk add openssl-dev yaml-dev zlib-dev \
  # Static build dependencies
  openssl-libs-static yaml-static zlib-static

WORKDIR /app
COPY shard.lock .
COPY shard.yml .
RUN shards install --production
COPY . .

RUN shards build <target> --static

FROM alpine:3.19
WORKDIR /
COPY --from=build /app/bin/<target> .
CMD ["/<target>"]