Support to add Image Pull Secrets for Docker Image

[Hareshraman]

Describe the feature request
To consume docker image of mockserver from a private docker hub.

What you are trying to do
I would like to bundle the docker image in my private docker repository to ensure i am able to run security scans on them , but in order to consume the image i would like to have an imagePullSecrets Section in mockServer chart.

The solution you'd like

{{- $imagePullSecret:= .Values.mockserver.imagePullSecret.name }}
apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ template "release.name" . }}
  namespace: {{ .Release.Namespace }}
  labels:
    app: {{ template "chart.name" . }}
    release: {{ .Release.Name }}
    chart: {{ template "chart.name_version" . }}
spec: #1682 
  imagePullSecrets:
    - name: {{ $imagePullSecret}}     ###############  Add Image Pull Secrets  ###############
  replicas: {{ .Values.replicaCount }}
  selector:
    matchLabels:
      app: {{ template "chart.name" . }}
      release: {{ .Release.Name }}
  template:
    metadata:
{{- if .Values.podAnnotations }}
      # Allows custom annotations to be specified
      annotations:
{{ toYaml .Values.podAnnotations | indent 8 }}
{{- end }}
      name: {{ template "release.name" . }}
      labels:
        app: {{ template "chart.name" . }}
        release: {{ .Release.Name }}
    spec:
      serviceAccountName: {{ .Values.app.serviceAccountName }}
      containers:
        - name: {{ template "release.name" . }}
          image: {{ if .Values.image.repositoryNameAndTag }}{{ .Values.image.repositoryNameAndTag }}{{- else }}{{ .Values.image.repository }}/mockserver:mockserver-{{- if .Values.image.snapshot }}snapshot{{- else }}{{ .Chart.AppVersion }}{{- end }}{{- end }}
{{- if .Values.image.snapshot }}
          imagePullPolicy: Always
{{- else }}
          imagePullPolicy: {{ .Values.image.pullPolicy }}
{{- end }}
          securityContext:
{{- if .Values.app.runAsUser }}
            runAsUser: {{ .Values.app.runAsUser }}
{{- end }}
            readOnlyRootFilesystem: {{ .Values.app.readOnlyRootFilesystem }}
            allowPrivilegeEscalation: false
          ports:
            - name: serviceport
              containerPort: {{ .Values.app.serverPort }}
              protocol: TCP
          readinessProbe:
            tcpSocket:
              port: serviceport
            initialDelaySeconds: 2
            periodSeconds: 2
            successThreshold: 1
            failureThreshold: 10
          livenessProbe:
            tcpSocket:
              port: serviceport
            initialDelaySeconds: 10
            periodSeconds: 5
            successThreshold: 1
            failureThreshold: 10
          env:
            - name: MOCKSERVER_LOG_LEVEL
              value: {{ .Values.app.logLevel | quote }}
            - name: SERVER_PORT
              value: {{ .Values.app.serverPort | quote }}
{{- if .Values.app.proxyRemoteHost }}
            - name: PROXY_REMOTE_HOST
              value: {{ .Values.app.proxyRemoteHost | quote }}
{{- end }}
{{- if .Values.app.proxyRemotePort }}
            - name: PROXY_REMOTE_PORT
              value: {{ .Values.app.proxyRemotePort | quote }}
{{- end }}
{{- if .Values.app.jvmOptions }}
            - name: JVM_OPTIONS
              value: {{ .Values.app.jvmOptions | quote }}
{{- end }}
{{- if .Values.app.mountConfigMap }}
            - name: MOCKSERVER_PROPERTY_FILE
              value: /config/{{ .Values.app.propertiesFileName }}
{{- end }}
          volumeMounts:
            - name: config-volume
              mountPath: /config
{{- if .Values.app.mountedLibsConfigMapName}}
            - name: libs-volume
              mountPath: /libs
{{- end}}
{{- if .Values.resources }}
          resources:
{{ toYaml .Values.resources | indent 12 }}
{{- end }}
      volumes:
        - name: config-volume
          configMap:
            name: {{ .Values.app.mountedConfigMapName }}
            optional: true
{{- if .Values.app.mountedLibsConfigMapName}}
        - name: libs-volume
          configMap:
            name: {{ .Values.app.mountedLibsConfigMapName }}
            optional: true
{{- end}}
{{- with .Values.nodeSelector }}
      nodeSelector:
{{ toYaml . | indent 8 }}
{{- end }}
{{- with .Values.affinity }}
      affinity:
{{ toYaml . | indent 8 }}
{{- end }}
{{- with .Values.tolerations }}
      tolerations:
{{ toYaml . | indent 8 }}
{{- end }}

Describe alternatives you've considered
N/A , although this would mean moving away from the base chart