Build dnf and libdnf with packit

[inknos]

Let's consider using packit to build dnf/libdnf.

Actions that packit could takeover:

• Build coprs in PRs
  • createrepo_c
  • dnf
  • dnf5
  • libdnf
• Run the ci-stack using packit from the source repo of each project
  • createrepo_c
  • dnf
  • dnf5
  • libdnf
• Run the tests from the ci-stack
• Run propose_downsream jobs
• Run bodhi updates

Build coprs in PRs:

• Quick to implement, few lines of code

Run tests with tmt:

• Quick to implement
• Some tweaks might be necessary to run dnf/dnf5 tests (currently the tests are set just for dnf5)

Run propose_downsream jobs:

• Tweaks in the specfile are necessary to have a nice changelog
• There might be problems when dnf depends on other components. Manual intervention necessary

Run bodhi updates

• Easy to implement
• Depend on propose_downstream mostly
• Have to be run manually when the previous step is also run manually

[inknos]

The first item, "Build coprs in PRs" is quick to address and will unblock the second part

#2023
rpm-software-management/libdnf#1636
rpm-software-management/createrepo_c#409

[inknos]

To run tests from ci-dnf-stack an approach like this should be taken and it will satisfy partially the step "Run tests with tmt and integrate with dnf5 recent changes in testing"
rpm-software-management/ci-dnf-stack#1415

[inknos]

The step "Run the ci-stack using packit from the source repo of each project" is covered in these PRs

#2034
rpm-software-management/createrepo_c#417
rpm-software-management/libdnf#1639

[inknos]

The step "Run the ci-stack using packit from the source repo of each project" requires a fix for the dnf4 stack

rpm-software-management/ci-dnf-stack#1435