Volume for plugins

[DblK]

Could you add a volume to $SONARQUBE_HOME/extensions/plugins?
That way, we could install new plugins without having to build a new image based on that one.

Same goes for config folder

[Godin]

Quoting #75 (comment) :

We removed declaration of volume for directory extensions in 80366e3 for the very good reasons after discussion in docker-library/official-images#2437 (comment)

And AFAIK absence of explicit declaration of volume does not prevent externalization of this directory:

$ docker run -v /tmp/sonarqube/extensions:/opt/sonarqube/extensions sonarqube

or using docker-compose:

version: "2"

services:
  sonarqube:
    image: sonarqube
    volumes:
      - ./extensions:/opt/sonarqube/extensions

Same goes for config folder.