In kscript 4.2.2, environment variable substitution for repositories no longer works.

The first problem is that the syntax is no longer {{FOO}} -- since the backend is now kotlin scripting, the syntax is now $FOO. See MavenDependenciesResolver.addRepository.

Once that is fixed, the next problem is that the gradle script that kscript writes and executes for --package contains the literal values $FOO, as createGradleRepositoryCredentials uses the raw values set for user and password rather than the resolved values.