deploy promtail on master node as default (#184)

Signed-off-by: Xiang Dai <764524258@qq.com>

production/helm/values.yaml

@@ -122,9 +122,12 @@ promtail:
   ## Tolerations for pod assignment
   ## ref: https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/
   ##
-  tolerations: []
+  tolerations:
+    - key: node-role.kubernetes.io/master
+      effect: NoSchedule
+
 
   ## Affinity for pod assignment
   ## ref: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity
   ##
-  affinity: {}
\ No newline at end of file
+  affinity: {}