[Tracker] Breaking update to the CI image

[Sam Thursfield <ssssam gmail com>]

Hello

Thanks to some work by Andrea Azzarone[1], we no longer accidentally

use any files from /usr when running the Tracker test suite.

I've updated the Docker image that we use to run the Tracker tests, to remove

the 'tracker' and 'tracker-miners' packages[2].

The 'master' and 'tracker-2.2' branches contain the necessary changes

so that the tests pass with the new Docker image.

If you are working on a branch of Tracker and it doesn't contain

the patches from [1], it'll fail now, so make sure you update your

branch on top of 'master' before opening. I'm sending this mail

to avoid anyone losing time to any 'mysterious' CI failures :-)

Let me know if you have any questions!
Sam

[1] https://gitlab.gnome.org/GNOME/tracker/merge_requests/74

[2] https://gitlab.gnome.org/GNOME/tracker-oci-images/merge_requests/4