Detect Android SDK using ANDROID_SDK_ROOT env var

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 7.0.7
• Cross-platform modules:
• Android Runtime:
• iOS Runtime:
• Plugin(s):

Describe the bug

On running the command ns doctor, I get this message

× The ANDROID_HOME environment variable is not set or it points to a non-existent directory. You will not be able to perform any build-related operations for Android.

However, I have the ANDROID_SDK_ROOT env var set which is equivalent to ANDROID_HOME.

To Reproduce

Run ns doctor

Expected behavior
I expected it to detect the Android SDK using the ANDROID_SDK_ROOT env var.

Sample project

Additional context

https://developer.android.com/studio/command-line/variables#envar

The ANDROID_HOME env var is deprecated. Refer to the link above.

Please guide me on how to fix this.

从 ns doctor 背后的实现及其 Android SDK 环境变量检查开始；issue 未指定文件或测试。在设置 ANDROID_SDK_ROOT 且不存在 ANDROID_HOME 的情况下验证行为，并确认 ns doctor 能识别 SDK 且不会发出警告。