Merge branch 'mysql' into 'production'

Set the MySQL password in the .env file

See merge request !8

templates/dotenv.erb

 APP_KEY=1eridaub9oepqakdd9n9ckmk2m33mkv2
-DB_PASSWORD=ControlAvHandboll
+DB_PASSWORD=<%= @mysql_password %>
 
 # <%# Put installed file in view mode when opened with Emacs: -%>
 # <%= "Nota bene: Puppet managed file, all local changes will be reverted." %>