Packit as Fedora dist-git CI

[lachmanfrantisek]

Based on #2453 and a Fedora Change Proposal, we would like to provide CI for Fedora dist-git pull requests. (As approved by FESCO.)

The following plan is based on the Fedora Change proposal timeline:

Plan

• phase 0: (current state)
  • opt-in (by Packit service configuration, let us know)
  • Scratch build being run (example PR)
• phase 1 (= public opt-in + scratch build):
  • Design opt-in configuration for Packit as a Dist-git CI packit#2522
  • Fedora dist-git CI scratch build use wrong source on PRs from upstream #2711
  • Announce phase 1 of Packit as a Fedora dist-git CI packit.dev#998
• phase 2 (= public opt-in + scratch build + installability check)::
  • Implement installability check for Packit as a Fedora dist-git CI #2712
  • public configuration for checks run by Packit by default (with installability being the only one for now)
  • design structure/storage/maintenance of the shared plans
  • Announce phase 2 of Packit as a Fedora dist-git CI packit.dev#999
• phase 3 (= public opt-in + scratch build + installability check + custom tests):
  • Run package-specific tests on Fedora dist-git pull requests #2713
  • Announce phase 3 of Packit as a Fedora dist-git CI packit.dev#1000
• final phase (= Fedora CI replacement):
  • To be designed (switch to default, deprecate FedoraCI, Fedora Zuul tenant)
  • user-configuration to tweak the workflow
  • Separate Packit deployment instance for CI; running in the Fedora Infrastructure
  • Announce the final phase of Packit as a Fedora dist-git CI packit.dev#1001

Other related issues:

• Packit as a Fedora dist-git CI: retriggering #2738
• packit-fedora-ci: Scratch builds on a PR to multiple branches overwrite each other #2736
• Move Fedora CI related code to a separate repository #2737