ci: Install upower to work-around tracker warning

And start a system bus to host it.

(tracker-miner-fs-3:2068): libupower-glib-WARNING **: 15:25:58.429: Couldn't connect to proxy: Could not connect: No such file or directory
(tracker-miner-fs-3:2068): Tracker-WARNING **: 15:25:58.429: Unable to connect to UPower
2 jobs for wip/hadess/upower-warning in 3 minutes and 35 seconds (queued for 1 second)