fix: allow overriding Enterprise image name using Helm #8361 (#8363)

* fix: allow overriding Enterprise image name using Helm #8361

* refactor: flatten image name construction logic for better readability

k8s/charts/seaweedfs/templates/shared/_helpers.tpl

@@ -135,7 +135,9 @@ Inject extra environment vars in the format key:value, if populated
 {{- $repositoryName := default .Values.image.repository .Values.global.repository | toString -}}
 {{- $name := .Values.global.imageName | toString -}}
 {{- $tag := default .Chart.AppVersion .Values.image.tag  | toString -}}
-{{- if $repositoryName -}}
+{{- if .Values.image.repository -}}
+{{-   $name = $repositoryName -}}
+{{- else if $repositoryName -}}
 {{-   $name = printf "%s/%s" (trimSuffix "/" $repositoryName) (base $name) -}}
 {{- end -}}
 {{- if $registryName -}}