addBuildPhase keeps adding phases when they already exist

This is the build script line

```
xcodeProject.addBuildPhase(
[], 'PBXShellScriptBuildPhase', 'Configure Crashlytics', undefined, options
).buildPhase;
fs.writeFileSync(xcodeProjectPath, xcodeProject.writeSync());
$logger.trace('Xcode project written');
} else {
$logger.error(xcodeProjectPath + ' is missing.');
reject();
return;
}
```

So I guess everytime the CLI build runs it adds a NEW "Configure Crashlytics" to the build phase. Eventually my machine just outright died because the script was running hundreds of times.

Is there maybe a way before this I can check to see if it exists first before just adding it again?

首先定位构建脚本中显示的 addBuildPhase 调用，并检查它如何处理名为 "Configure Crashlytics" 的现有阶段。针对一个 Xcode 项目重新运行 CLI 构建多次；当重复运行后只保留一个这样的构建阶段，并且仍能成功写入项目时，即表示完成。

由索引模型根据 Issue 内容生成。