xref:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/240/diffs
https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/123/diffs#587d266bb27a4dc3022bbed44dfa19849df3044c
https://stackoverflow.com/questions/65886747/how-to-speed-up-gitlab-ci-build-of-a-c-c-project-with-caching
problem: what to do with kaniko?