Add support for rhel9

[Barthelemy]

No description provided.

[TimoWilken]

Hi Barth, thank you, but in the past we've always used slcX for all distros compatible with RHEL version X, e.g. slc8 for CentOS 8, Alma 8, RHEL 8 etc. If there's nothing special about RHEL9, I'd keep doing the same and just call it slc9.

Good point about adding it to the help message and S3_SUPPORTED_ARCHS, we should do that for rhel9 or slc9, whatever it ends up being called.

[Barthelemy]

Hi,
I see, I am not against using slc9 if that is the convention.
I'll update the PR.

[Barthelemy]

is it what you meant ?

[TimoWilken]

I would also remove the unused "rhel" pattern (done in 4ccd30c), but apart from that it looks perfect to me! I'll merge it once the checks are done.

[TimoWilken]

Thank you very much @Barthelemy!

[awegrzyn]

Just FYI, currently distro package returns:

• ('Red Hat Enterprise Linux', '9.2', 'Plow') for RHEL9
• ('AlmaLinux', '9.2', 'Turquoise Kodkod') for Alma9

Therefore, with current implementation of doDetectArch we end up with: rhel9_x86-64 and slc9_x86-64 respectively.
To unify that I'd simply add red hat enterprise linux to https://github.com/alisw/alibuild/blob/master/alibuild_helpers/utilities.py#L153

[TimoWilken]

Good catch, thanks @awegrzyn! I'll change it as you suggest.

[TimoWilken]

Merged; thanks @Barthelemy and @awegrzyn! In case of any further issues, please let me know!