chore(helm chart): add priority class name (#31)

deploy/helm/README.md

@@ -20,6 +20,7 @@ A Helm chart to deploy alertmanager-discord to Kubernetes
 | nodeSelector | object | `{}` |  |
 | podAnnotations | object | `{}` |  |
 | podSecurityContext.fsGroup | int | `2000` |  |
+| priorityClassName | string | `""` | https://kubernetes.io/docs/concepts/scheduling-eviction/pod-priority-preemption/ |
 | replicaCount | int | `1` |  |
 | resources.limits.cpu | string | `"100m"` |  |
 | resources.limits.memory | string | `"128Mi"` |  |

deploy/helm/templates/deployment.yaml

@@ -22,6 +22,9 @@ spec:
       imagePullSecrets:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+      {{- if .Values.priorityClassName }}
+      priorityClassName: {{ .Values.priorityClassName }}
+      {{- end }}
       serviceAccountName: {{ include "alertmanager-discord.serviceAccountName" . }}
       securityContext:
         {{- toYaml .Values.podSecurityContext | nindent 8 }}

deploy/helm/values.yaml

@@ -24,6 +24,9 @@ podAnnotations: {}
 podSecurityContext:
   fsGroup: 2000
 
+# -- https://kubernetes.io/docs/concepts/scheduling-eviction/pod-priority-preemption/
+priorityClassName: ""
+
 securityContext:
   capabilities:
     drop: