Support custom config file

[jazelly]

Is your feature request related to a problem? Please describe.
It seems I cannot specify a config file

Describe the solution you'd like
Ideally, I can run migration with --env or --config

Describe alternatives you've considered

Additional context

[Wolfium]

Maybe a little bit late, but checking on this framework to use it on my personal protect

I haven't tried it yet, based on this example, and due to it being a javascript file running
Would it be possible to use a usual environment variable instead of a hard-coded string for the connection and/or database name?

If that is the case, you could use a different variable value on each environment and it should do the trick