[help needed] Build on macOS x86_64

[lfoppiano]

I think we should keep supporting macOs x86_64, any help is welcomed:

• installing a local github runner
• providing help for building macos on x86_64 using qemu and the free github actions
• anything else

[AaronNGray]

@lfoppiano - Do you have a MacOS x64 machine ?

If not either :-

• you can either add me as a collborator to kermitt2/pdfalto and I can add my MacBook.
• I will try adding a Self hosted runner on my pdfalto repository first.

[lfoppiano]

I'm glad you solved the issue without any self hosted runner
😅 I don't have full access to this repository, I would have to ask Patrice to make those changes.

[AaronNGray]

BTW Windows/ARM64 can be cross complied and linked on Windows/x64 too. I have that test on ICU. So ALL platforms can be done with GitHub Runners ! At least on public repos.

I separated out the Windows build code here :-
https://github.com/AaronNGray/icu/blob/windows-build/.github/workflows/icu4c-windows.yml