[Rpm-maint] [rpm-software-management/rpm] Match Dockerfile against OS version too (PR #4214)

[Michal Domonkos]

When looking for a Dockerfile that's compatible with the host OS, also look at the OS version (not just name). We override `FROM` to the OS version anyway, so actually check if the given version is supported. That's now indicated by Dockerfile symlinks.

Additionally, print a warning when no matching Dockerfile is found, which looks like this (on a hypothetical Fedora 45):

```
CMake Warning at tests/CMakeLists.txt:106 (message):
  Could NOT find matching Dockerfile for host fedora-45 (found: fedora-43,
  fedora-44).  Reverting to containerized test builds.
```

Fixes: #4213 
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/4214

-- Commit Summary --

  * Match Dockerfile against OS version too
  * Emit CMake warning for no matching Dockerfile

-- File Changes --

    M tests/CMakeLists.txt (20)
    M tests/Dockerfile.fedora (1)
    A tests/Dockerfile.fedora-43 (1)
    A tests/Dockerfile.fedora-44 (1)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/4214.patchhttps://github.com/rpm-software-management/rpm/pull/4214.diff
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