GitLab

Create digest and save it along with repo artifacts

See merge request !2

When some packages share the same base name the get_current_version may return multiple version number which is an error.

The script accept one parameter to disable the usage of the cache to
build the image.

This should allow to fix issues of docker cache easier but still
manually.

Some packages requires clang, it is not present and not listed in
explicit make dependencies.