testing: enable sound

TODO.md

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+**work in progress**
+
+Enable sound for HipChat4
+
+```
+docker-compose -f docker-compose.yml -f docker-compose.sound.yml up hipchat
+```
+
+TODO: add `pulseaudio` to the Dockerfile and test the above command

docker-compose.sound.yml

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+version: '2'
+
+# pulseaudio has to be installed in Dockerfile for this to be working!
+
+services:
+  hipchat:
+    volumes:
+      - /etc/localtime:/etc/localtime:ro
+      - /etc/machine-id:/etc/machine-id:ro
+      - /run/user/1000/pulse:/run/user/1000/pulse
+      - /dev/shm:/dev/shm
+    environment:
+      - PULSE_SERVER=unix:/run/user/1000/pulse/native