Convert upstream-dev CI scripts to github Action

[dcherian]

Is your feature request related to a problem?

No.

Describe the solution you'd like

If possible, I think it'd be nice to move a lot of the upstream-dev CI scripting to its own github action like "ci-trigger". This will make it easier to use in other projects (like those under xarray-contrib). I'd like to use it for flox, cf-xarray.

Describe alternatives you've considered

No response

Additional context

No response