[YUNIKORN-1082] Honor imagePullSecrets for admission controller (#81)

diff --git a/helm-charts/yunikorn/templates/admission-controller-deployment.yaml b/helm-charts/yunikorn/templates/admission-controller-deployment.yaml
index db51ea1..de15d8d 100644
--- a/helm-charts/yunikorn/templates/admission-controller-deployment.yaml
+++ b/helm-charts/yunikorn/templates/admission-controller-deployment.yaml
@@ -40,6 +40,12 @@
         component: yunikorn-admission-controller
         release: {{ .Release.Name }}
     spec:
+      {{- if .Values.imagePullSecrets }}
+      imagePullSecrets:
+      {{- range .Values.imagePullSecrets }}
+      - name: {{ . }}
+      {{- end }}
+      {{- end }}
       serviceAccountName: {{ .Values.admissionController.serviceAccount }}
       {{- with .Values.admissionController.nodeSelector }}
       nodeSelector: