Migations path.join vs path.resolve giving `C:/path/C:/path`.

[oliverfoster]

Have just come across an AAT issue related to this PR - specifically these lines. The AAT passes absolute paths, so we were getting something like C:/path/C:/path.

Switching from path.join to path.resolve fixes this for me

If we should be passing the rootDir somehow via the AAT, let me know (not sure if this is hooked up to the CLI API)

Originally posted by @taylortom in #3668 (comment)

[oliverfoster]

This section of the referenced pr explains how rootDir is used and passed through from the cli.