This commit replaces `os.Setenv` with `t.Setenv` in tests. The
environment variable is automatically restored to its original value
when the test and all its subtests complete.
Reference: https://pkg.go.dev/testing#T.Setenv
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
* Move and rename genversions.go and tests
* Fix lint - bring back cli.Exit
* Move package.json and fix tests
* Add necessary env vars for promote event
