Merge: gitlab-ci: add android

Add android test and build to gitlab-ci. This also fixes some issues.

Note: the version of the android tools are not the most recent. Trying to update the android toolchain to a more modern one should be done in another PR.

Prof of concept: https://gitlab.com/nit/nit-ci/-/jobs/164255403/artifacts/browse/apk/

Pull-Request: #2736