You should remember that you don’t have mix after you created a release version, instead you can use Ecto.Migrator for those tasks.
I’ve tried several methods of doing migrations, and the best method on running production environments is to run migration via remote console, you can do this by starting a bash console inside of your container.
Another method is to create something like a GenServer for migration and add it to your application supervision tree, this way your migrations will run automatically everytime the server is started.
If you don’t want your system to run while migration is in progress, the best bet is to create a script that will execute a rpc call to your migration function, then start the server.
