OK, then use $DEPLOY_PRIME_URL or $DEPLOY_URL or $URL directly (note that you need to do something to use them as described here:
…or do the trick I mentioned to set the GATSBY_* variables which you don’t have to “use” as described in that article 
OK, then use $DEPLOY_PRIME_URL or $DEPLOY_URL or $URL directly (note that you need to do something to use them as described here:
…or do the trick I mentioned to set the GATSBY_* variables which you don’t have to “use” as described in that article