feat(helm): support custom priorityClassName (#908)

Set priorityClassName through Helm chart. Defaults to
`system-cluster-critical`.

Requested in #848

Author: lukasmetzner

chart/.snapshots/default.yaml

@@ -93,4 +93,4 @@ spec:
             requests:
               cpu: 100m
               memory: 50Mi
-      priorityClassName: system-cluster-critical
+      priorityClassName: "system-cluster-critical"

chart/templates/deployment.yaml

@@ -104,7 +104,9 @@ spec:
           volumeMounts:
             {{- toYaml . | nindent 12 }}
           {{- end }}
-      priorityClassName: system-cluster-critical
+      {{- if .Values.priorityClassName }}
+      priorityClassName: {{ .Values.priorityClassName | quote }}
+      {{- end }}
       {{- with .Values.extraVolumes }}
       volumes:
         {{- toYaml . | nindent 8 }}

chart/values.yaml

@@ -113,6 +113,10 @@ nodeSelector: {}
 # Set the affinity for pods. (Only works with kind=Deployment)
 affinity: {}
 
+# pods priorityClassName
+# ref: https://kubernetes.io/docs/concepts/scheduling-eviction/pod-priority-preemption
+priorityClassName: "system-cluster-critical"
+
 robot:
   # Set to true to enable support for Robot (Dedicated) servers.
   enabled: false

deploy/ccm-networks.yaml

@@ -99,4 +99,4 @@ spec:
             requests:
               cpu: 100m
               memory: 50Mi
-      priorityClassName: system-cluster-critical
+      priorityClassName: "system-cluster-critical"

deploy/ccm.yaml

@@ -91,4 +91,4 @@ spec:
             requests:
               cpu: 100m
               memory: 50Mi
-      priorityClassName: system-cluster-critical
+      priorityClassName: "system-cluster-critical"