fix icon not displayed when template created via upload file (#5658)

api/http/handler/customtemplates/customtemplate_create.go

@@ -279,9 +279,11 @@ func (payload *customTemplateFromFileUploadPayload) Validate(r *http.Request) er
 	if err != nil {
 		return errors.New("Invalid custom template description")
 	}
-
 	payload.Description = description
 
+	logo, _ := request.RetrieveMultiPartFormValue(r, "Logo", true)
+	payload.Logo = logo
+
 	note, _ := request.RetrieveMultiPartFormValue(r, "Note", true)
 	payload.Note = note
 

app/portainer/views/custom-templates/create-custom-template-view/createCustomTemplateViewController.js

@@ -30,6 +30,7 @@ class CreateCustomTemplateViewController {
       ComposeFilePathInRepository: 'docker-compose.yml',
       Description: '',
       Note: '',
+      Logo:'',
       Platform: 1,
       Type: 1,
       AccessControlData: new AccessControlFormData(),