Limit the maximum number of revisions saved per helm release (#2894)

* Limit the maximum number of revisions saved per helm release

roles/kubernetes-apps/helm/defaults/main.yml

@@ -18,3 +18,6 @@ helm_skip_refresh: false
 
 # Override values for the Tiller Deployment manifest.
 # tiller_override: "key1=val1,key2=val2"
+
+# Limit the maximum number of revisions saved per release. Use 0 for no limit.
+# tiller_max_history: 0

roles/kubernetes-apps/helm/tasks/main.yml

@@ -34,6 +34,7 @@
     {% if rbac_enabled %} --service-account=tiller{% endif %}
     {% if tiller_node_selectors is defined %} --node-selectors {{ tiller_node_selectors }}{% endif %}
     {% if tiller_override is defined %} --override {{ tiller_override }}{% endif %}
+    {% if tiller_max_history is defined %} --history-max={{ tiller_max_history }}{% endif %}
   when: (helm_container is defined and helm_container.changed) or (helm_task_result is defined and helm_task_result.changed)
 
 - name: Helm | Set up bash completion