Check that a redis instance actually exists
Check that a redis instance actually exists

The pre-release hook causes containers without matching redis containers to always get an environment variable that looks like: REDIS_URL=redis://:6379 set. This is a problem if you wish to share one redis instance between two containers, or name your redis instance with a name that doesn't match the app name, and later link it manually.
mehulsbhatt/dokku-alt,dokku-alt/dokku-alt,beedesk/dokku-alt,stnly/dokku-alt,vfulco/dokku-alt,netbrick/dokku-alt,netbrick/dokku-alt,bewest/dokku-alt,netbrick/dokku-alt,netbrick/dokku-alt,dsrowell/dokku-alt,beedesk/dokku-alt,netbrick/dokku-alt,stnly/dokku-alt,stnly/dokku-alt,beedesk/dokku-alt,mehulsbhatt/dokku-alt,mehulsbhatt/dokku-alt,dsrowell/dokku-alt,vfulco/dokku-alt,bewest/dokku-alt,mehulsbhatt/dokku-alt,dsrowell/dokku-alt,dokku-alt/dokku-alt,dokku-alt/dokku-alt,beedesk/dokku-alt,bewest/dokku-alt,vfulco/dokku-alt,stnly/dokku-alt,bewest/dokku-alt,netbrick/dokku-alt,vfulco/dokku-alt,mehulsbhatt/dokku-alt,netbrick/dokku-alt,dokku-alt/dokku-alt,dsrowell/dokku-alt,stnly/dokku-alt,mehulsbhatt/dokku-alt,beedesk/dokku-alt,dsrowell/dokku-alt,bewest/dokku-alt,vfulco/dokku-alt,bewest/dokku-alt,stnly/dokku-alt,stnly/dokku-alt,sekjun9878/dokku-redis-plugin,beedesk/dokku-alt,bewest/dokku-alt,vfulco/dokku-alt,netbrick/dokku-alt,vfulco/dokku-alt,mehulsbhatt/dokku-alt,bewest/dokku-alt,stnly/dokku-alt,beedesk/dokku-alt,dsrowell/dokku-alt,vfulco/dokku-alt,dokku-alt/dokku-alt,dokku-alt/dokku-alt,dsrowell/dokku-alt,dokku-alt/dokku-alt,mehulsbhatt/dokku-alt,dsrowell/dokku-alt,beedesk/dokku-alt,dokku-alt/dokku-alt