can not use explict repo in offline mode when coursier cache has only POM file

[bishabosha]

Version(s)
1.4.0 (problematic in scala 3.5.0-RC3 release when installing from cs install scala:3.5.0-RC3)

Describe the bug
in offline mode, If the coursier cache is only partially populated by POM, and no jar file (such is the state after running the cs install command) - then any explicitly added local repository is ignored and classpath resolution fails

To Reproduce
follow steps in coursier/coursier#3024

Expected behaviour
I have passed an explicit repo in offline mode, I expect to resolve the classpath from there, the fact that coursier complains underneath is a leaky abstraction.

[Gedochao]

Known workarounds:

• remove the Scala compiler pom from Coursier cache (or just purge the cache)
• pass an empty directory in the COURSIER_CACHE env variable