Environment Variables for building and publishing KMM libraries

I am trying to move some of my Android/KMM libraries I have over to use Space and building them with Space's Jobs. One question I have is, is there a way to set Environment variables for things like private keys/passwords for my maven repo?

For example I would have my build.gradle setup like this

repositories{
    maven{
        url = uri("myUri")
        credentials{
            username = System.getenv("USERNAME")
            password = System.getenv("PASSWORD")
        }
    }
}

These projects are open source but I don't want the credentials to be committed where everyone can see them.

Also what container would be used for the jobs to build KMM projects?