Can we configure global variable
SCD_ON_DEMAND variable in
env.php or somewhere else to mention about it for Magento 2 open source edition projects.
SCD_ON_DEMAND variable is using in Magento 2.3 cloud setup. If its true then it will skips Static content deploy during build and deployment.
In Magento 2.2.x developer mode, SCD is not required at all but any settings or configuration available for open source edition so one can use for
production mode also.
SCD - static content deploy