[gnome-music] Non-fast-forward update to branch sam/tracker3-self-contained

[Sam Thursfield <sthursfield src gnome org>]

The branch 'sam/tracker3-self-contained' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  46060a2... WIP: Allow running a local Tracker instance inside the Flat

Commits added to the branch:

  7f9f78a... WIP: Allow running a local Tracker instance inside the Flat