CI duplicates code to build MFC

[sbryngelson]

Different CI files all do the same thing, something like calling this:

MFC/.github/workflows/cleanness.yml

Line 27 in f125c24

sudo apt install -y tar wget make cmake gcc g++ python3 python3-dev "openmpi-*" libopenmpi-dev

Which isn't really a big deal, until we change dependencies or something.

It would be useful if maybe we had a way of consolidating this? Or even exposing it to the user for different OSs.

For example, right now I think the linked line needs to apt install fftw.

[sbryngelson]

The solution is probably to create a script that runs the appropriate build commands for different OSs and keep it in version control somewhere. The script can even be one or two lines long, but then it's DRY and we can change build commands once.

Would recommend cating this script before running it in CI so the user knows what was run.