fix(ci): add missing 'with' block for checkout step in backend and frontend jobs

.gitea/workflows/ci.yml

@@ -13,6 +13,8 @@ jobs:
         working-directory: backend
     steps:
       - uses: actions/checkout@v4
+        with:
+          github-server-url: http://gitea.lab
 
       - name: Set up JDK 21
         uses: actions/setup-java@v4
@@ -42,6 +44,8 @@ jobs:
         working-directory: frontend
     steps:
       - uses: actions/checkout@v4
+        with:
+          github-server-url: http://gitea.lab
 
       - name: Set up Node 20
         uses: actions/setup-node@v4