Distinguish Between Stage and Production With FreeMarker

This should do it!

${config.getString("phase", "prod")}

If, for some reason, that doesn't work for you, I also found another option in a post from PerBonomi ( Too many tabs? Can't tell Prod and Stage apart anymore? ) :

<#if current_url?contains("<insert stage-unique url section, e.g. community-stage.site.com>") == true>

Cheers!