Merge pull request #783 from BasVanBoven/master

Update docker/entrypoint.sh to allow for sideloading of PIP packages (e.g. additional mopidy plugins)

docker/entrypoint.sh

@@ -6,4 +6,9 @@ then
     export PULSE_COOKIE=$HOME/pulse.cookie
 fi
 
-exec "$@"
+if [ ${PIP_PACKAGES:+x} ]; then
+    echo "-- INSTALLING PIP PACKAGES $PIP_PACKAGES --"
+    python3 -m pip install --no-cache $PIP_PACKAGES
+fi
+
+exec "$@"