CI runners clean-up

[iakov]

1. macOS 10.15 was removed from GHA long ago.
   https://github.blog/changelog/2022-07-20-github-actions-the-macos-10-15-actions-runner-image-is-being-deprecated-and-will-be-removed-by-8-30-22/
2. Python 2.7 is obsolete, thus removed for Windows and macOS, but still in CentOS7
3. RockyLinux9 is here for CI from now on

[mrbean-bremen]

I think the actual problem is the missing support for Python 2.7, also with the previous runner. I'm not sure how to test Python 2.7 on MacOS at all with that problem...

[mrbean-bremen]

Ok, and I just saw:

Warning: The support for python 2.7 will be removed on June 19

for the Windows build, so the same problem here :(

[iakov]

@mrbean-bremen Seems like we have two different issues to address.

1. macOS 10.15 runner is outdated. And I propose to silently shift to the available one.
2. python 2.7 is unavailable for "low-effort" installation, but can be installed after some additional work.

What is your opinion, if there are any good reasons to keep CI builds with the Python 2.7 on modern OSes? Probably, the Centos7 build is enough to check a backward compatibility.

[mrbean-bremen]

Probably, the Centos7 build is enough to check a backward compatibility.

This is actually what I also thought, but wanted to wait for your opinion. So, yes - I see no reason to preserve the other 2.7 CI builds (also considering that the effort to install 2.7 will only ever increase).

[he-hesce]

As long as it continues to work with Python 2.7 on CentOS 7 as RHEL 7 is still in support window and in production use for a few more years.

[he-hesce]

Thought would be nice with test builds on Rocky 9 (RHEL 9) as that may be the next platform for those moving on up from CentOS 7 (RHEL 7) in the coming years once extended support expires. Rocky 9 would be Python 3.9.

[mrbean-bremen]

As long as it continues to work with Python 2.7 on CentOS 7 as RHEL 7 is still in support window and in production use for a few more years

As long as the docker container is available, this should not be a problem.

Thought would be nice with test builds on Rocky 9 (RHEL 9) as that may be the next platform for those moving on up from CentOS 7 (RHEL 7) in the coming years once extended support expires. Rocky 9 would be Python 3.9.

Sure, this should be easy to setup if needed.

[mrbean-bremen]

Hopefully, 3.6 will be supported a bit longer by GH Actions, but eventually it will also go... Well we can deal with it when it becomes a problem.

[iakov]

Ready for review (and squash-merge). The check fails because of qt.io download access problem, might be it can be just re-run once again.

[mrbean-bremen]

Thanks - @he-hesce will be happy 😄

[he-hesce]

:-) I and everyone supporting production systems for 10-20 years from original release will be happy.