Cross-compile for linux/arm64 and push multi-platform Docker images.

[vitropy]

No description provided.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
entropy-core	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 22, 2023 0:57am

[ameba23]

This looks great, and i image it was a lot of work so well done.

I don't think i can add much useful feedback, have very little experience with dockerhub and none with compiling for arm64, so leaving this as 'Comment'.

[vitropy]

This looks great, and i image it was a lot of work so well done.

I don't think i can add much useful feedback, have very little experience with dockerhub and none with compiling for arm64, so leaving this as 'Comment'.

Thanks, @ameba23. I probably should have written more in the description of this pull request, but I've been a bit wiped this week. The short version is: try this out and let me know how you fare? You might need an Apple Silicon macOS machine to test the linux/arm64 images, though, but the ultimate intent of this PR is to make sure that a single container image tag name points to an OCI image manifest list as opposed to a single image's manifest. This is visible in the Docker Hub UI by going to one of the new multi-platform images and viewing the OS/platform drop-down:

This way, regardless of whether you're on an Apple Silicon macOS device, or a computer with an Intel x86 chipset, you can just use the same docker image pull ... command and the image appropriate for your platform will be downloaded. 🤞

I ultimately decided to forego simultaneous builds for each platform and instead used Docker BuildKit's built-in multi-platform support because it substantially simplified the CI/CD workflow files without costing much overhead in terms of time build time and without adding (too much) complexity to the Dockerfile itself. All of the CPU-intensive build steps (compiling, etc) are now performed in the build platform's native environment, so we retain the overwhelming majority of the speed boost over using QEMU for building. We still build server and entropy in parallel, as well.