Allow imagePullSecret in operator helm chart

Operator users may host the image in their own repositories, protected
by authentication.  Accept an imagePullSecret to facilitate these use
cases.

helm/solr-operator/README.md

@@ -174,6 +174,7 @@ The command removes all the Kubernetes components associated with the chart and
 | image.repository | string | `"apache/solr-operator"` | The repository of the Solr Operator image |
 | image.tag | string | `"v0.9.0-prerelease"` | The tag/version of the Solr Operator to run |
 | image.pullPolicy | string | `"IfNotPresent"` |  |
+| image.imagePullSecret | string | `""` | PullSecret for the Solr Operator image |
 | fullnameOverride | string | `""` | A custom name for the Solr Operator Deployment |
 | nameOverride | string | `""` |  |
 | replicaCount | int | `1` | The number of Solr Operator pods to run |

helm/solr-operator/templates/deployment.yaml

@@ -46,6 +46,9 @@ spec:
       - name: {{ .Chart.Name }}
         image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}" 
         imagePullPolicy: {{ .Values.image.pullPolicy }}
+        {{- if .Values.image.imagePullSecret }}
+        imagePullSecret: {{ .Values.image.imagePullSecret }}
+        {{- end }}
         args:
         {{- if or (index .Values "zookeeper-operator" "install") (index .Values "zookeeper-operator" "use") }}
         - -zk-operator=true

helm/solr-operator/values.yaml

@@ -23,6 +23,7 @@ image:
   repository: apache/solr-operator
   tag: v0.9.0-prerelease
   pullPolicy: IfNotPresent
+  imagePullSecret: ""
 
 nameOverride: ""
 fullnameOverride: ""