feat(apple): support disabling metal validation

[Saadnajmi]

Description

A couple of repositories (react-native-webgpu, @shopfiy/react-native-skia) need to have Metal Validation turned off for their libraries to run (and be tested in CI. Let's add a way to enable/disable that from the manifest.

Note:

• For whatever reason, when enableGpuValidationMode = "1" is in the xcscheme, that actually means that Metal API Validation is off. To turn it back on, you can't set it to "0", you have to remove the line. 🤷‍♂️

Platforms affected

• Android
• iOS
• macOS
• visionOS
• Windows

Test plan

Added and removed the key from the example apps' App.json, re-ran pod install and verified that Metal API Validation would flip.

[Saadnajmi]

@wcandillon FYI

[wcandillon]

this is very cool 😎☺️ Thank you for doing this.

[Saadnajmi]

Not obvious to me: Not every key in the app.json seems tested. Should I add some sort of test, or leave it as is?

[Saadnajmi]

Oh, another note. Using REXML removes the newlines from the xcscheme so the structure of the file is different, but it's still usable by Xcode. Just thought I'd make sure to mention that.

[tido64]

Not obvious to me: Not every key in the app.json seems tested. Should I add some sort of test, or leave it as is?

I would really appreciate it if you added tests.

[Saadnajmi]

Not obvious to me: Not every key in the app.json seems tested. Should I add some sort of test, or leave it as is?

I would really appreciate it if you added tests.

I looked around the repo and I'm not sure I am coming up with a good test.. mostly because to practically test you need "pod install" to run, and/or a screenshot of Xcode with the scheme open

[tido64]

✅ Verified that enableGPUValidationMode='1' gets written

Thanks for adding this feature ❤️