helm chart VolumeMounts & Volumes for Selenium hub (SeleniumHQ#1893)

* helm chart VolumeMounts & Volumes for hub

Add the extraVolumes & extraVolumeMounts in values. Also add the
block of volumes & volumeMounts in hub deployment yaml.

Fixes SeleniumHQ#1801

* Update Readme

---------

Co-authored-by: Diego Molina <[email protected]>

Author: yo-ga

charts/selenium-grid/README.md

@@ -241,6 +241,8 @@ You can configure the Selenium Hub with this values:
 | `hub.subPath`                   | `/`               | Custom sub path for the hub deployment                                                                                                           |
 | `hub.extraEnvironmentVariables` | `nil`             | Custom environment variables for selenium-hub                                                                                                    |
 | `hub.extraEnvFrom`              | `nil`             | Custom environment variables for selenium taken from `configMap` or `secret`-hub                                                                 |
+| `hub.extraVolumeMounts`         | `[]`              | Extra mounts of declared ExtraVolumes into pod                                                                             |
+| `hub.extraVolumes`              | `[]`              | Extra Volumes declarations to be used in the pod (can be any supported volume type: ConfigMap, Secret, PVC, NFS, etc.)     |
 | `hub.resources`                 | `{}`              | Resources for selenium-hub container                                                                                                             |
 | `hub.securityContext`           | `See values.yaml` | Security context for selenium-hub container                                                                                                      |
 | `hub.serviceType`               | `ClusterIP`       | Kubernetes service type (see https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types)                 |

charts/selenium-grid/templates/hub-deployment.yaml

@@ -71,6 +71,10 @@ spec:
           envFrom:
               {{- toYaml . | nindent 12 }}
         {{- end }}
+        {{- with .Values.hub.extraVolumeMounts }}
+          volumeMounts:
+            {{- tpl (toYaml .) $ | nindent 12 }}
+        {{- end }}
         {{- with .Values.hub.resources }}
           resources: {{- toYaml . | nindent 12 }}
         {{- end }}
@@ -94,4 +98,8 @@ spec:
     {{- with .Values.hub.priorityClassName }}
       priorityClassName: {{ . }}
     {{- end }}
+    {{- with .Values.hub.extraVolumes }}
+      volumes:
+        {{- tpl (toYaml .) $ | nindent 8 }}
+    {{- end }}
 {{- end }}

charts/selenium-grid/values.yaml

@@ -295,6 +295,16 @@ hub:
     #   name: proxy-settings
     # - secretRef:
     #   name: mysecret
+  extraVolumeMounts: []
+  # - name: my-extra-volume
+  #   mountPath: /home/seluser/Downloads
+
+  extraVolumes: []
+  # - name: my-extra-volume
+  #   emptyDir: {}
+  # - name: my-extra-volume-from-pvc
+  #   persistentVolumeClaim:
+  #     claimName: my-pv-claim
   # Resources for selenium-hub container
   resources: {}
   # SecurityContext for selenium-hub container