A little cleaning up of the Dockerfile

[esciara]

Hi @cptactionhank ,

Quite impressed about the automation of the docker images creation you put in place here, I must say... Cool stuff ! 👍 .

Not sure about the initial history of your Dockerfile (and the other atlassian Dockerfile you initiated), but I could find some changes made the official Atlassian Dockerfile (at least up to version 6.3 as they are moving to Alpine after that) that includes some cleanup that might be interesting to introduce here, and that will not change the behavior of the image:

• Introduction of environment variables for:
  • daemon (RUN_USER and RUN_GROUP)
  • CONF_DOWNLOAD_URL
  • MYSQL_VERSION
  • MYSQL_DRIVER_DOWNLOAD_URL
• usage of CONF_INSTALL and CONF_HOME in more places

What about adding them ? Will create a pull request.

Em