Improve GitLab jobs for building Android packages with Craft
In particular, this adds support for a project-specific .craft.ini
.
Successfully tested with Kirigami-Gallery:
- Experimental branch using the jobs: https://invent.kde.org/sdk/kirigami-gallery/-/tree/work/kloecker/craft-android
- Pipeline running the jobs: https://invent.kde.org/sdk/kirigami-gallery/-/pipelines/256432