Creating multi-arch images with cross

[Emilgardis]

Checklist

• I've looked through the issues and pull requests for similar request
• This feature could be solved with a custom docker image (optional)

Describe your request

Simplify or explain creating multi-arch images with cross

for example: https://stackoverflow.com/questions/71466241/docker-buildx-multiarch-from-existing-binaries

Describe why this would be a good inclusion for cross

No response

[Alexhuszagh]

Although somewhat unrelated, this also depends on self-hosted runners and is linked to #610, since we will need macOS, Windows, and ARM64 Linux runners in total.

[Emilgardis]

Would we? I fail to see how.

[Alexhuszagh]

Would we? I fail to see how.

At least early on I believe. The musl and crosstool builds will take forever otherwise when built via Qemu (I've tried a few times) without a cache. The crosstool builds already take quite a while building a 3-stage compiler.