ci: fix failure, again

for some reason, having upgraded the OS environment to ubuntu 22.04 from
20.04, the tests were failing. specifically the mainloop example tests were
running into an unexpected failure when trying to setup their conext
objects. when they tried to do so, the PA client library was returning an
error of value `-1`, corresponding to an "access" error.

researching the problem turned up discussions of other people encountering
audio issues after upgrading their systems, and the solutions from one
particular discussion seemed to revolve around pipewire, but through
experimentation i discovered that pipewire was not actually installed
within the ci environment, and installing it, along with `pipewire-pulse`
and `pipewire-media-session`, including performing the suggested fix, made
no difference.

eventually my experiments led to the solution being applied in this commit,
which actually worked, obviously. for some reason running the application
directly as a deamon just doesn't work anymore in this new environment, it
starts but we get this access error from our test application. however
starting the user systemd service instead makes all the difference.

i've left an additional status query in there for future debugging purposes.

Author: jnqnfe

.github/workflows/test.yml

@@ -70,7 +70,9 @@ jobs:
           sudo apt-get install pulseaudio libpulse-mainloop-glib0 libpulse-dev
 
       - name: Start PulseAudio
-        run: pulseaudio -D --start
+        run: |
+          systemctl --user start pulseaudio
+          systemctl --user status pulseaudio
 
       - name: Check toolchain versions
         run: |