Factor setup compiler actions

[AntoinePrv]

Factor the setup compiler scripts as a Github action.
This is the first step, then if it goes well, I'd take it out in a separate repo in this org to reuse with xsimd-algorithm, xtensor...

[AntoinePrv]

@serge-sans-paille what do you think?

[JohanMabille]

I like the idea!

[serge-sans-paille]

Big fan of that work, thanks a bunch.
Minor nit, you may want to split qemu to an independent action, but really don't overdo it

[serge-sans-paille]

It's a bit strange to have qemu be part of the compiler setup, but I guess it's okay.
I wouldn't mind keeping it as a separate step though.

[AntoinePrv]

Yes, in term of separation of concerns this would be best to split it.
But I kept it pragmatic: when we need to cross compile, we'll need qemu, so let's avoid too much yamling.
I'd keep it this way for now, but we can always split it later.

[AntoinePrv]

This can be used with

uses: xtensor-stack/xsimd/.github/actions/setup-cross-compiler-apt@main

I'd keep it in this repo for now, to give it a bit of mileage before putting it on its own.