entrypoint.sh: allow users to execute commands specified in a `entrypoint.custom.sh` script
entrypoint.sh: allow users to execute commands specified in a `entrypoint.custom.sh` script

Closes #108
Refer #34

otsuka512/docker-redmine,sameersbn/docker-redmine,EvgenyKarataev/docker-redmine,hasegaw/docker-redmine,sameersbn/docker-redmine,joshuacox/docker-redmine,patope/docker-redmine,sameersbn/docker-redmine,EvgenyKarataev/docker-redmine,joshuacox/docker-redmine,patope/docker-redmine,otsuka512/docker-redmine,vladm/docker-redmine,hasegaw/docker-redmine,ekulos/docker-redmine,tigerich/docker-redmine,vladm/docker-redmine,ekulos/docker-redmine,otsuka512/docker-redmine,tigerich/docker-redmine