ci: use pre-built CI container in coverage and test workflows

[adrianreber]

Replace fedora:latest with the weekly built CI container image from ghcr.io and remove the dnf install steps, as all packages are already included in the container.

[github-actions]

Test Results

90 tests  ±0   90 ✅ ±0   4s ⏱️ ±0s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit a86f696. ± Comparison against base commit eea83bf.

♻️ This comment has been updated with latest results.

[adrianreber]

Package are not public:

 Public

Make this package visible to anyone.
Setting is disabled by organization administrators. 

and I cannot change it.

[rst0git]

@adrianreber We can also use quay.io/criu/checkpointctl-ci. I've added username and secret to the checkpointctl repository.

[adrianreber]

Thanks. It would be more efficient to use the ghcr registry as it is much closer and faster. We need an organization admin to allow public images. I guess Andrei should be able to do it.

[adrianreber]

Wait, better idea coming.

[rst0git]

It would be more efficient to use the ghcr registry as it is much closer and faster.

btw, I'm not sure if it is actually faster: https://github.com/orgs/community/discussions/27080

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.27%. Comparing base (6e607c0) to head (a86f696).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #217      +/-   ##
==========================================
+ Coverage   79.98%   84.27%   +4.28%     
==========================================
  Files          16       16              
  Lines        1759     1920     +161     
==========================================
+ Hits         1407     1618     +211     
+ Misses        263      224      -39     
+ Partials       89       78      -11     

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