Current situation
the flatcar sdk is for an amd64 host. All arm64 image and binaries are cross-compiled.

Impact
now that powerful arm64 machines are readily available, it's currently not an option to use them for builds

Ideal future situation
A flatcar arm64 image can be built from an arm64 host.

TODO

• Provide SDK for ARM64
• Integrate ARM64 SDK into release pipeline and release SDK tarballs (and possibly SDK containers)