Added the missing containers from rpi-docker-images

mopidy/etc/cont-init.d/init-plugins.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/with-contenv sh
+
+if [ "$MOPIDY_PLUGINS" != "" ]; then
+	echo "Installing plugins $MOPIDY_PLUGINS"
+	pip3 install $MOPIDY_PLUGINS
+fi

mopidy/etc/services.d/crond/run

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+crond -f

mopidy/etc/services.d/mopidy/run

@@ -0,0 +1,3 @@
+#!/usr/bin/execlineb -P
+
+mopidy