fix workflow error

.gitea/workflows/build.yaml

@@ -1,12 +1,12 @@
+---
 name: Build
 on: [push]
-
 jobs:
   build-server:
     runs-on: ubuntu-latest
     steps:
       - cargo build -p server
-  build-server:
+  build-client:
     runs-on: ubuntu-latest
     steps:
       - cargo build -p client