Make the base & minimal notebook containers not amd specific (e.g. support building for arm64) (#1368)

* Dynamically select the right miniforge arch and unpin the ROOT_CONTAINER so that buildx can build arm64 and amd64

cleanup

* Remove the commented out hard set of arch

* Address code review comments from mathbunnyru

* Add setting the owner to respective dockerhbub username

* Revert "Add setting the owner to respective dockerhbub username"

This reverts commit a8d9c468a7d35dbda33ae902cc524db599519d8a.

* Fix up the dockerfile, make the default buildx compatible with the CI and add a comment about how to do cross-platform builds.

* Update the docs

* Refactor the Makefile to support cross-building images incrementally, add ARG OWNER to the Dockerfile's so people can more easily push to their own, add docker buildx & ARM64 support to the CI

* Simplify build-test-all rule

* Match patch version

* Run prettier on docker.yml

* Declare and export seperately per docker lint

* Skip CI changes

* Revert the makefile changes

* Update the Arch comment to match

* back out unrelated changes