The GitLab instance has been moved around, so the SSH clone URI for
repositories has changed. Change that in `CONTRIBUTING.md`, and also
change to using a relative path in `.gitmodules` to insulate from
similar URI changes in future.
Changing to a relative path in `.gitmodules` also enables the CI to use
submodules more easily: https://docs.gitlab.com/ee/ci/git_submodules.html
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Rather than carrying the copylib around inside GLib, which is a pain to
synchronise and affects our code coverage statistics.
This requires updating the CI images to cache the new subproject,
including updating the `cache-subprojects.sh` script to pull in git
submodules.
It also requires adding `gioenumtypes_dep` to be added to the
dependencies list of `libgio`, since it needs to be build before GVDB as
it’s pulled in by the GIO headers which GVDB includes.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #2603
