Allow upgrade to work in docker process

Author: samrocketman

scripts/upgrade/upgrade_build_gradle.sh

@@ -28,6 +28,7 @@ trap cleanup_temp_on EXIT
 source env.sh
 #set password if using vagrant
 [ -n "${VAGRANT_JENKINS}" ] && source "${SCRIPT_LIBRARY_PATH}/vagrant-env.sh"
+[ -n "${DOCKER_JENKINS}" ] && source "${SCRIPT_LIBRARY_PATH}/docker-env.sh"
 
 #protect user from accidentally upgrading a remote Jenkins
 #this should always be localhost