Set default tag to testing-daily in OSM helm chart

Change-Id: If73d982bd3ca810083248bf47edfc8d1e8e4f1b6
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/helm/values/airflow-values.yaml b/installers/helm/values/airflow-values.yaml
index 2bcd44d..9d05c4f 100644
--- a/installers/helm/values/airflow-values.yaml
+++ b/installers/helm/values/airflow-values.yaml
@@ -13,7 +13,7 @@
 #
 ---
 defaultAirflowRepository: opensourcemano/airflow
-defaultAirflowTag: "13"
+defaultAirflowTag: "testing-daily"
 webserverSecretKeySecretName: airflow-webserver-secret
 webserver:
   service: