try to add a simple github action

[cfbolz]

No description provided.

[mattip]

cool. Of course this is not really portable since it builds on ubuntu-20.04. Is it worth building inside a manylinux_2014 docker? The artifact does have value for bisecting failures like the one in #4816.

[cfbolz]

@mattip yeah, it's not properly portable at all, but without --make-portable it doesn't even work on my ubuntu 23.10 laptop, so this is still an improvement. I would like to merge this as it is, we can find out how to do Docker in a github action as a later step. ok for you?

[mattip]

Yes, makes sense.

[cfbolz]

cool, merging then 😊