Noone did set this issue to solved, the OP just changed the subject since it was maybe solved for him, not sure - quite an old topic you dug up here 
Anyways, if yours is crashing after a reboot, can you please provide some more details? Are we talking about a system reboot here (as in you reboot the box which holds the containers) or are we talking about a restart of the docker containers? Can you provide the logs for when this happens? volumes/app/mattermost/logs/mattermost.log and/or the output of docker logs would help.
Update: Scratch that, found your other (newer) topic, let’s work on this issue there: