ci: modify CI workflow to trigger tests only on push events

Adjust the GitHub Actions workflow configuration to restrict test execution to push events only, removing the previous pull request trigger for main and master branches.

将 GitHub Actions 工作流配置调整为仅在 push 事件时执行测试，移除之前针对 main 和 master 分支的 pull request 触发器。

Change-Id: If7e83a49adb9b6fcfe7611cd9fa36efb8f23f4ad
Signed-off-by: OhYee <[email protected]>

Author: OhYee

.github/workflows/ci.yml

@@ -1,9 +1,8 @@
 name: CI
 
 on:
+  # 仅在 push 时触发测试
   push:
-  pull_request:
-    branches: [main, master]
 
 jobs:
   build: