Fix admin controller l() error and redundant CI runs

Add l() wrapper to AdminSimpleWithdrawalController so PS8 routing does
not throw UndefinedMethodError; restrict build workflow to branch pushes
only so tag pushes no longer trigger a redundant build run.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -2,6 +2,8 @@ name: Build
 
 on:
   push:
+    branches:
+      - '**'
   pull_request:
 
 jobs: