KOJI_PROFILE= environment variable only works for localhost

[ktdreyer]

We can set a default profile with the KOJI_PROFILE environment variable, but this only works if we're executing tasks on localhost, not on remote hosts.

[ktdreyer]

https://docs.ansible.com/ansible/latest/user_guide/playbooks_environment.html makes me think we can resolve this with documentation. I need to test that using environment: works on remote nodes, then update the KOJI_PROFILE documentation section in the README to describe how to set KOJI_PROFILE using that method.

[ktdreyer]

Yeah, environment: works fine, so we need to document this.