Cherry-pick Ubuntu and Debian aarch64/AMD64 into own branch and merge to master

[Matthew-Beckett]

Is your feature request related to a problem? Please describe. (Optional)

Currently builds for multi-arch and multi-distro are supported on the branch experimental/aarch64. This supports Debian Buster Slim, Ubuntu, and Alpine image creation on AMD64 and aarch64 except for Alpine where only the init image is built for aarch64 due to limitations with the upstream distribution and availability of Temurin.

Describe the solution you'd like

Cherry-pick Ubuntu and Debian Buster-Slim and stabilise the work onto master branch for AMD64 and aarch64, Alpine will only be stablilised for AMD64 on this branch. The branch experimental/aarch64-alpine will continue efforts to bring Alpine aarch64 support via Jlink as well as eventually merge support for aarch64 on the init container.

Describe alternatives you've considered
Discussed internally with project governance, no alternatives.

Additional context
Add any other context or screenshots about the feature request here.

[RemcoSpigot]

I'll pick this up tomorrow, thank you for the issue!

[RemcoSpigot]

Please review branch experimental/multi-os. Thank you! 😄