Multiple environments (dev, stage?) for a single project using different config files/directories

[jdoubleu]

Describe the solution you'd like
I'd like to be able to set a (different) config path for the ddev command.
Just like docker-compose support an option to define a different config file.

I could imagine something like ddev --config=.ddev_other_env and ddev would use the .ddev_other_env/ directory.

It would be possible to test the application in different environment.
E.g. different php versions, future but yet unstable php features, MySQL vs MariaDB, etc.

Describe alternatives you've considered
At the moment one can parameterize the .ddev/config.yml and use a bash script to modify the config.

But this approach is error prone and might lead to unexpected behavior. Especially when (accidentally) changing the config while ddev is running.

Additional context
Add any other context or screenshots about the feature request here.

[rfay]

One thing you might consider doing is having two projects, check out the branch you want for each. So two git checkouts, configured with different project names. They'd have completely different databases. Would that solve the problem described here?

[jdoubleu]

That would be a solution, thanks!