Update repository image for airflow components to use bitnamilegacy

Change-Id: I959bed09eaeb402901b5ad0b9f66f99ed14dc44a
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 6e03682..a78f3e6 100644
--- a/installers/helm/values/airflow-values.yaml
+++ b/installers/helm/values/airflow-values.yaml
@@ -41,6 +41,10 @@
     hosts:
       - name: "localhost"
     ingressClassName: nginx
+postgresql:
+  image:
+    repository: bitnamilegacy/postgresql
+    tag: 11
 # scheduler:
 #   resources:
 #     requests: