Merge branch '82.prologue-deploy-the-develop-branch-to-staging' into 'develop'

Change the on-grid continuous deployment tool to deploy the "develop" branch to the staging grid

See merge request !176

nixos/modules/update-deployment

@@ -13,14 +13,10 @@ shift
 # configuration that controls what value is actually passed when an update is
 # triggered.
 case "${GRIDNAME}" in
-    "local")
+    "local"|"testing")
 	BRANCH="develop"
 	;;
 
-    "testing")
-	BRANCH="staging"
-	;;
-
     "production")
 	BRANCH="production"
 	;;