fix #2991 - make Helm creation of postgreql succeed when installing multiple AWX on different namespaces on same kubernetes

Signed-off-by: Fabrice Flore-Thebault <themr0c@users.noreply.github.com>

installer/roles/kubernetes/tasks/main.yml

@@ -80,7 +80,8 @@
 
 - name: Deploy and Activate Postgres (Kubernetes)
   shell: |
-    helm install --name {{ kubernetes_deployment_name }} --namespace {{ kubernetes_namespace }} \
+    helm upgrade --install --name {{ kubernetes_namespace }}-{{ kubernetes_deployment_name }} \
+      --namespace {{ kubernetes_namespace }} \
       --set postgresqlUsername={{ pg_username }} \
       --set postgresqlPassword={{ pg_password }} \
       --set postgresqlDatabase={{ pg_database }} \