Add more logging to the copr-builder-ready script

[FrostyX]

So it doesn't have an empty stdout when everything went fine, e.g.

[2024-10-16 22:31:55,344][  INFO][PID:3774651] Checking that builder machine is OK
[2024-10-16 22:31:56,157][  INFO][PID:3774651] 
[2024-10-16 22:31:56,158][  INFO][PID:3774651] Filling build.info file with builder info

[FrostyX]

Now the logs looks like this for Fedora

[2024-10-17 10:30:57,720][  INFO][PID:4101539] Checking that builder machine is OK
[2024-10-17 10:30:58,347][  INFO][PID:4101539] Red Hat subscription not needed for fedora-40-x86_64
Builder is ready to be used

And RHEL:

[2024-10-17 10:30:48,604][  INFO][PID:4101535] Checking that builder machine is OK
[2024-10-17 10:30:48,699][  INFO][PID:4101535] Checking Red Hat subscription (attempt #1)
Red Hat subscription active
Builder is ready to be used

[praiskup]

nit: ton't you want to show stderr, if provided? might give us some warnings in advance

[FrostyX]

We do

if rc:
    self.log.info(stderr)

which should IMHO work fine.

[praiskup]

but if rc == 0 and there's some output, we just swallow it

[FrostyX]

I did it this way because for some reason my stderr is polluted by this line when testing this locally

Shared connection to builder closed.

So I intentionally wanted to swallow it. But we haven't seen that message in STG so I am confused.

[praiskup]

🤷 if you want to hear my opinion, I don't think the logs need to be pretty - but must be complete (minus credentials, haha). But it is up to you, I already approved this PR.

[praiskup]

Anyway, looks good. Thanks!