Multi-platform Docker image for Forest

[LesnyRumcajs]

Issue summary

Currently, we offer a Forest image for linux/amd64, which should work on Mac M1, provided certain virtualization prerequisites are installed and configured. This may get a bit messy, and the out-of-the-box experience for the user should be better than that.

This can be done easily with QEMU; unfortunately, the cross-compilation duration using this utility is way too slow - around 30-40 minutes using the best buildjet worker. A native build (as suggested by @elmattic, thanks) on a regular machine takes only 10 minutes.

It would be fantastic to do two native builds, one for amd64 and another for arm64 and end up with a single, multi-platform image. The alternative is to have multiple tags and achieve multi-platform capacity this way, e.g. latest-arm, v0.6.0-arm. Easy to implement, but not the best experience we can offer.

Other information and links

A failed attempt can be found here #2475. In the end, I managed to produce a working native image for M1, but it's far from a perfect solution.

[LesnyRumcajs]

Another trick is to reuse built binaries from other workflows to avoid re-compilation. The YAML files might get complex, though.

[LesnyRumcajs]

For reference https://www.docker.com/blog/faster-multi-platform-builds-dockerfile-cross-compilation-guide/ (it gives more precise instructions for Go, but it seems like a good reference).

Rust guide that will probably do the trick https://blog.container-solutions.com/building-multiplatform-container-images