[api/extensions] Allow empty mode when GoPluginSource is set

Author: dilyevsky

api/extensions/v1alpha2/validation.go

@@ -62,7 +62,7 @@ func (r *EdgeFunction) validate() field.ErrorList {
 errs = append(errs, field.Invalid(field.NewPath("spec").Child("template").Child("mode"), r, "mode must be either 'filter' or 'backend'"))
 }
 
-if spec.Template.Code.GoPluginSource != nil && spec.Template.Mode != FilterEdgeFunctionMode {
+if spec.Template.Code.GoPluginSource != nil && (spec.Template.Mode != FilterEdgeFunctionMode || spec.Template.Mode != "") {
 errs = append(errs, field.Invalid(field.NewPath("spec").Child("template").Child("code").Child("goPluginSource"), r, "goPluginSource can only be specified when mode is 'filter'"))
 }