fmf: Hack around Testing Farm's tag-repository priority

[martinpitt]

TF runs add the Fedora tag repository with priority=9. This breaks upstream reverse dependency tests, as that repository will then win over our "main builds" COPR and thus run tests against a mismatching cockpit-podman rpm.

Counter the hack by dropping the tag repo priority and reinstalling cockpit-podman.

---

See e.g. containers/podman#19953 and all other recent upstream podman PRs, where tests fail like this , because

podman-4.7.0~dev-1.20230913192200752553.pr19953.1753.38e069f70.fc38.x86_64
cockpit-podman-75-1.fc38.noarch

i.e. this is an outdated Fedora build (not even 76, which is in stable!), instead of the main build.

[martinpitt]

I'm testing this in cockpit-project/cockpit#19332

@thrix see your recent slack discussion. This is a quick hack to stop breaking all of podman's PRs. We'd have to do the same for cockpit itself to stop breaking udisks, but it's less pressing. If/once there's a more TF-global way of fixing this, we can revert this again. Thanks!

[martinpitt]

Test in cockpit-project/cockpit#19332 was successful:

+ for f in $(grep -l -r 'testing-farm-tag-repository' /etc/yum.repos.d)
+ sed -i /priority/d /etc/yum.repos.d/tag-repository.repo
+ dnf update -y cockpit-podman
[...]
Running transaction
  Preparing        :                                                        1/1 
  Upgrading        : cockpit-podman-76-1.20230914050413208140.main.8.g315   1/2 
  Cleanup          : cockpit-podman-76-1.fc38.noarch                        2/2 
  Verifying        : cockpit-podman-76-1.20230914050413208140.main.8.g315   1/2 
  Verifying        : cockpit-podman-76-1.fc38.noarch                        2/2 

Upgraded:
  cockpit-podman-76-1.20230914050413208140.main.8.g315448d.fc38.noarch          

👍

This will also fix cockpit's own revdeps runs.

[jelly]

This is a bit akward, as we have to hack it in every project. But it should work.