WIP: Speed up CI with ccache
Closes #665
This commit will enable ccache on Linux-based runners. It will need to be done manually in the OSX and Windows based runners. It may be best done outside .gitlab-ci.yml on Linux too.
Closes #665
This commit will enable ccache on Linux-based runners. It will need to be done manually in the OSX and Windows based runners. It may be best done outside .gitlab-ci.yml on Linux too.