I think this is ready for review unless you see problems in it?

these were just comments on why I don't have a check for ubuntu in this area, nothing needs to be done.

I apologize for the too many revisions, and that the initial patch wasn't in a production ready state, but it's now ready for merging, I believe.

Use "apt update" before "llvm/actions/install-ninja" which uses "apt install" without "apt update" beforehand
Apt update is now its own step for ease of readability and a less hacky looking solution with running it within the first step which installs packages

One second please I have an improvement to make

commit message should be:

CI: run "apt update" once per job before installing packages

imo

In D152064#4392960, @tstellar wrote:

Do you need me to commit this for you? If so, what name and email should I use for the commit author?

In D152064#4392949, @tstellar wrote:

LGTM. Thank You.

removed double "sudo"

there's a double sudo, one second while I fix it.