Add mem limits to new app issue template

.gitlab/issue_templates/new_app.md

@@ -11,6 +11,9 @@
    * [ ] `flux2/apps/APP/kustomization.yaml`
    * [ ] If needed, add PVCs in `flux2/apps/APP/pvc.yaml`
    * [ ] Add helmrelease in `flux2/apps/APP/release.yaml`
+     * Mem resource requests/limits: See https://open.greenhost.net/stackspin/stackspin/-/issues/1027
+      * [ ] mem request: the median weekly memory usage of an app
+      * [ ] mem limit: 150% of the weekly max memory usage
 
 ### Single sign-on