public String value() {
        return switch (this) {
            case prod -> "prod";
            case staging -> "staging";
            case test -> "test";
            case dev -> "dev";
            case perf -> "perf";
        };
    }
Returns a name of this which is used in external API's and stored in persistent stores
config-provisioning/src/main/java/com/yahoo/config/provision/Environment.java