migrate DataSource.groovy and Config.groovy

[ghost]

It seems that it might be possible to automate the migration of these by appending the contents of DataSource.groovy to Config.groovy and storing the result in the Grails 3 app in grails-app/conf/application.groovy.

However, it's not clear whether this is likely to work. If so, should we remove the grails-app/conf/application.yml config file that's created by default?

Some care should be taken when concatenating the 2 config files, because any imports in the second file will need to be removed and added to the top of the resulting file.

Given that the log4j config in Config.groovy needs to be migrated to logback.groovy, it seems unlikely that it will be possible to fully automate this task, and parially automating automating it seems like asking for trouble.