Overview of changes in lomiri-music-app 3.1.1

  - .gitlab-ci.yml: Use UBports GitLab runner.

Overview of changes in lomiri-music-app 3.1.0

  - CMakeLists.txt: Install music-app-content.json as
    DATADIR/lomiri-content-hub/peers/lomiri-music-app when built in
    non-click mode.
  - Translation updates (thanks to all contributors on
    hosted.weblate.org).

