Make sure the override works with pubdash

pkg/services/publicdashboards/service/query.go

@@ -243,6 +243,7 @@ func groupQueriesByPanelId(dashboard *simplejson.Json) map[int64][]*simplejson.J
 
 		var panelQueries []*simplejson.Json
 
+		cacheTTLOverride := panel.Get("queryCachingTTL").MustInt64(0)
 		for _, queryObj := range panel.Get("targets").MustArray() {
 			query := simplejson.NewFromAny(queryObj)
 
@@ -257,6 +258,10 @@ func groupQueriesByPanelId(dashboard *simplejson.Json) map[int64][]*simplejson.J
 					query.Set("datasource", datasource)
 				}
 
+				if cacheTTLOverride > 0 {
+					query.Set("queryCachingTTL", cacheTTLOverride)
+				}
+
 				panelQueries = append(panelQueries, query)
 			}
 		}