API application build npm script is not cross platform

[johnymontana]

The build npm script for the api application errors on Windows due to this command:

shx cp .env build 2>/dev/null || :

specifically 2>/dev/null || : - this is used to pipe any error in the case that .env does not exist to dev/null and also not return a non-zero exit code.

This should be changed to something that works cross platform for conditional copy (check if exists, etc)