Add a comment about the plain docker command for manually starting it

tasks/main.yml

@@ -33,3 +33,5 @@
         tag: 'app.matterbridge'
 
   when: '"matterbridge" not in excluded_roles'
+
+# docker run --name matterbridge --restart always -v=/etc/matterbridge.toml:/matterbridge.toml --log-driver fluentd --log-opt fluentd-address='tcp://localhost:24224' --log-opt tag='app.matterbridge' -d 42wim/matterbridge