Implement copr repository provider

[AthreyVinay]

Resolves #4385

Pull Request Checklist

• implement the feature
• extend the test coverage

[tcornell-bus]

I am a little confused about this stage: prepare, I see it in copr_build.py too. But I do not see it defined in any schema file?

[AthreyVinay]

You are right to be confused (at-least for now)! Currently the schema does not have the stage: xxx defined - however I think it will be introduced shortly once the install phase kicks in. So essentially, we will have:

1. stage: prepare
2. stage: install

Again this is based on my understanding - @psss WDYT?

[tcornell-bus]

Cursor seems to think the logger should be passed in here since it's a required argument in the constructor for the Common class in tmt/utils/init.py

When I installed the built tmt package for this PR and took it for a spin, I got the following error that seems to reinforce that:

plan failed.

The exception was caused by 1 earlier exceptions

Cause number 1:

    prepare step failed

    The exception was caused by 1 earlier exceptions

    Cause number 1:

        Failed to initialize or use artifact provider 'copr.repository:@teemtee/stable'.

        The exception was caused by 1 earlier exceptions

        Cause number 1:

            Common.__init__() missing 1 required keyword-only argument: 'logger'

[AthreyVinay]

Addressed here: b97a8c3

[tcornell-bus]

Thanks for the quick update! The new complaint seems to be:

'Copr' object has no attribute 'copr_plugin'

[AthreyVinay]

Thanks Therese for testing this out again. Okay, so I have refactored / cleaned the constructor of Copr - b62d365. Need to know how you test this out :)