Improve way to include submodules
Right now, all parts in CI jobs related to submodules are commented:
- https://git.opencarp.org/openCARP/openCARP-CI/-/blob/master/.gitlab/ci/archive.gitlab-ci.yml#L12
- https://git.opencarp.org/openCARP/openCARP-CI/-/blob/master/.gitlab/ci/archive.gitlab-ci.yml#L30
- https://git.opencarp.org/openCARP/openCARP-CI/-/blob/master/.gitlab/ci/release.gitlab-ci.yml#L1
- https://git.opencarp.org/openCARP/openCARP-CI/-/blob/master/.gitlab/ci/release.gitlab-ci.yml#L33
It could be great to have a more elegant way to activate the parts related to submodules, with a boolean variable INCLUDE_SUBMODULES
for example.