[feature request] Dynamic test environments

[UncleTawnos]

I'd like to be able to change path on host depending on some ENV variable I can set at CI tool
The scenario is: there are multiple branches to be deployed to test server to apache virtual directories
there is a vhost responding to .test.domain.com and code after being built by CI should be deployed into /srv/www/tests//current

Currently, as far as I know there is no option to change deployment path on a variable. At the moment I'm using sed on .mage.yml to "tweak" it on each build, but something built-in would be welcome

ideally would be if we could overwrite any config element just like --branch

[andres-montanez]

This should be addressed by having different entries in your .mage.yml config file, defining one entry per environment.