Init Email configuration from env var with docker

Would be nice to setup Email configuration from environment variables (like email.* ):

From:

To:

if [[ "$envvar_key" =~ sonar.* ]] || [[ "$envvar_key" =~ ldap.* ]] || [[ "$envvar_key" =~ email.* ]]; then 

Github issue for minor improvement: https://github.com/SonarSource/docker-sonarqube/issues/416

Hey, thanks for your suggestion. We already have in our backlog the topic of reworking the way we deal with settings. I added this page to the list of links from the community.