Normalize (make lowercase) the ldap group dn when onboarding

Fixes #5895

Signed-off-by: Touch Ungboriboonpisal <tungbori@zynga.com>

.gitignore

@@ -32,6 +32,7 @@ src/portal/typings/
 **/*npm-debug.log.*
 **/*yarn-error.log.*
 .idea/
+*.iml
 .DS_Store
 .project
 .vscode/

src/common/dao/group/usergroup.go

@@ -116,6 +116,8 @@ func UpdateUserGroupName(id int, groupName string) error {
 // This is used for ldap and uaa authentication, such the usergroup can have an ID in Harbor.
 // the keyAttribute and combinedKeyAttribute are key columns used to check duplicate usergroup in harbor
 func OnBoardUserGroup(g *models.UserGroup, keyAttribute string, combinedKeyAttributes ...string) error {
+	g.LdapGroupDN = utils.TrimLower(g.LdapGroupDN)
+
 	o := dao.GetOrmer()
 	created, ID, err := o.ReadOrCreate(g, keyAttribute, combinedKeyAttributes...)
 	if err != nil {