[Feature] Parameterize K8s Deployment's Tolerations in helm chart (#878)

Author: jwierzbo

chart/kube-arangodb/README.md

@@ -113,6 +113,32 @@ NodeSelector for Deployment pods.
 
 Default: `{}`
 
+### `operator.tolerations`
+
+Tolerations for Deployment pods.
+
+There is built in configuration (can not be changed):
+```yaml
+tolerations:
+- key: "node.kubernetes.io/unreachable"
+  operator: "Exists"
+  effect: "NoExecute"
+  tolerationSeconds: 5
+- key: "node.kubernetes.io/not-ready"
+  operator: "Exists"
+  effect: "NoExecute"
+  tolerationSeconds: 5
+```
+
+which can be extended by additional entries e.g.:
+```yaml
+tolerations:
+- key: devops
+  operator: Exists
+  effect: NoSchedule
+```
+Default (empty): `[]`
+
 ### `operator.replicaCount`
 
 Replication count for Operator deployment.

chart/kube-arangodb/templates/deployment.yaml

@@ -181,3 +181,6 @@ spec:
                   operator: "Exists"
                   effect: "NoExecute"
                   tolerationSeconds: 5
+{{- if .Values.operator.tolerations }}
+{{ toYaml .Values.operator.tolerations | indent 16 }}
+{{- end }}

chart/kube-arangodb/values.yaml

@@ -45,5 +45,8 @@ operator:
     base: alpine:3.11
     metricsExporter: arangodb/arangodb-exporter:0.1.7
     arango: arangodb/arangodb:latest
+
+  tolerations: []
+
 rbac:
   enabled: true