Add Packit commit trigger job

[evgeni]

Implements https://community.theforeman.org/t/rfc-packit-based-nightlies-for-everyone/44268

What are the changes introduced in this pull request?

Considerations taken when implementing this change?

What are the testing steps for this pull request?

Summary by Sourcery

Add a commit-triggered Copr build job to .packit.yaml by reusing the Pull Request job configuration through a YAML anchor

New Features:

• Add a Packit copr_build job triggered on commits to the master branch for theforeman/develop repository

Enhancements:

• Refactor the existing copr_build job into a reusable YAML anchor to avoid duplication

[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• Verify that owner: '@theforeman' and project: develop actually correspond to the target repository, since develop looks more like a branch name than a project.
• Consider adding branch or path filters to the commit-triggered job so that nightly COPR builds only run on relevant changes and don’t trigger on every commit.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Verify that `owner: '@theforeman'` and `project: develop` actually correspond to the target repository, since `develop` looks more like a branch name than a project.
- Consider adding branch or path filters to the commit-triggered job so that nightly COPR builds only run on relevant changes and don’t trigger on every commit.

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