template the domainName in ingress

chart/templates/ingress.yaml

@@ -18,7 +18,7 @@ metadata:
     {{- end }}
 spec:
   rules:
-    - host: {{ .Values.global.domainName }}
+    - host: {{ tpl .Values.global.domainName . }}
       http:
         paths:
         - backend:
@@ -31,7 +31,7 @@ spec:
 {{- if .Values.ingress.letsEncrypt.enabled }}
   tls:
     - hosts:
-        - {{ .Values.global.domainName }}
+        - {{ tpl .Values.global.domainName . }}
       secretName: {{ include "shibboleth-sp.frontend.fullname" . }}-letsencrypt-certs
 {{- end }}
 {{- end }}