oidc, add default gitlab icon

Signed-off-by: dignow <linlong1265@gmail.com>

flutter/lib/common/widgets/login.dart

@@ -14,6 +14,7 @@ import './dialog.dart';
 
 const kOpSvgList = [
   'github',
+  'gitlab',
   'google',
   'apple',
   'okta',
@@ -72,6 +73,11 @@ class ButtonOP extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final opLabel = {
+          'github': 'GitHub',
+          'gitlab': 'GitLab'
+        }[op.toLowerCase()] ??
+        toCapitalized(op);
     return Row(children: [
       Container(
         height: height,
@@ -97,8 +103,7 @@ class ButtonOP extends StatelessWidget {
                   child: FittedBox(
                     fit: BoxFit.scaleDown,
                     child: Center(
-                        child: Text(
-                            '${translate("Continue with")} ${op.toLowerCase() == "github" ? "GitHub" : toCapitalized(op)}')),
+                        child: Text('${translate("Continue with")} $opLabel')),
                   ),
                 ),
               ],