Is something wrong with the cache in quick jobs?

[philderbeast]

Is there something wrong with the cache in quick jobs;

Post job cleanup.
Warning: Path Validation Error: Path(s) specified in the action for caching do(es) not exist,
hence no cache is being saved.

Originally posted by @philderbeast in #9804 (comment)

[andreasabel]

Looks like this is part of the XDG fallout:

The path to be cached is non-XDG:
https://github.com/haskell/cabal/actions/runs/8294806206/job/22700513058?pr=9804#step:3:3

path: ~/.cabal/store

Also the CI author intends to use non-XDG:
https://github.com/haskell/cabal/actions/runs/8294806206/job/22700513058?pr=9804#step:2:1

echo "$HOME/.cabal/bin" >> $GITHUB_PATH

But cabal is working in XDG mode:
https://github.com/haskell/cabal/actions/runs/8294806206/job/22700513058?pr=9804#step:6:7

Writing default configuration to /home/runner/.config/cabal/config

https://github.com/haskell/cabal/actions/runs/8294806206/job/22700513058?pr=9804#step:7:15

Symlinking 'alex' to '/home/runner/.local/bin/alex'

A workaround might be to force non-XDG by creating ~/.cabal/bin before adding it to the PATH in step 2.
Another fix would be to change the cached path to the XDG one.

See also:

• Consider using XDG directory structure for cabal in CI #8855