Debug and document clearing cache

[j-adamczyk]

Is there an existing issue for this?

• I have searched existing issues, it hasn't been reported yet

Use case description

I had to clean libraries cache to fix "Cannot unpack zip" error. There is a cleanCache option, but it is currently undocumented. Additionally, it does not print where cache is cleaned without --debug option, and additionally it does not clean all .zip files from cache, I had to do this manually.

Proposed solution (optional)

1. Add sls requirements cleanCache to docs
2. Include information about --debug flag to see cache location
3. Fix cleanCache to remove everything in the cache