Use reusable workflow to build an arm64 container on ubuntu-24.04-arm.

[hturner]

Using the reusable workflow from #252, create a workflow to build an arm64 container on a Linux arm64 runner (ubuntu-24.04-arm, see github.com/orgs/community/discussions/148648
).

[iaine]

I have a running workflow that has completed, but do we need to add the platform to it as a tag?