Before testing, install the necessary media files. This allows the
automated tracker tests to work in LAVA.

Apertis: https://phabricator.apertis.org/T2051
Differential Revision: https://phabricator.apertis.org/D4904


Reviewed-by: Luis Araujo <luis.araujo@collabora.co.uk>
Signed-off-by: Marc Ordinas i Llopis <marcoil@collabora.co.uk>