Set --shared-ccache for prerelease tests if CCACHE_DIR is set#670

Draft

mathias-luedtke wants to merge 3 commits intoros-industrial:masterfrom mathias-luedtke:feature/prerelease-ccache

+28-11

Commits on May 5, 2021

REMOVE: use cli-ccache branch of ros_buildfarm
mathias-luedtke
committed

Commits on May 6, 2021