* chore(ci): MCOL-6071 less sccache granularity
* chore(ci): MCOL-6071 clean old versions of .deb/.rpm files in s3 when publishing
* chore(ci): MCOL-6071 fix unittests execution
* install sccache after deps, to have curl
* chore(ci) MCOL-6071 review fixes
---------
Co-authored-by: Leonid Fedorov <leonid.fedorov@mariadb.com>