Add CCACHE_BINARY path to Xcode build settings and use it in ccache scripts

[ste7en]

Summary:

When building a react native app from Xcode and ccache has been set to be used, the ccache-clang.sh and ccache-clang++.sh scripts cannot find ccache, because Xcode PATH does not include ccache binary.
What I've done is setting a CCACHE_BINARY user-defined Xcode setting containing the result of executing command -v ccache during pod install execution and directly calling it in ccache scripts, set by ReactNativePodsUtils when ccache is enabled.

Fixes #46126

Changelog:

[IOS] [FIXED] - fix ccache not found error exporting ccache binary path as Xcode user-defined setting to be used by ccache scripts

Test Plan:

Correctly builds helloworld and RNTester apps using ccache by enabling it at pod install time: USE_CCACHE=1 pod install.

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[cipolleschi]

@ste7en thanks for the fix! Could you sign the CLA, please? Otherwise I'm not allowed to import the PR in our repo!

[ste7en]

Sure @cipolleschi, didn't know about the CLA. Just signed it, thanks!

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

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@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cipolleschi merged this pull request in d31ac83.

[react-native-bot]

This pull request was successfully merged by @ste7en in d31ac83

^{When will my fix make it into a release? | How to file a pick request?}

[mefjuu]

@ste7en Thanks for the fix. Works great. But I wonder is it okay to store local setup ccache path into project.pbxproj? Maybe it's worth to consider moving this variable to .xcode.env generating script (with-environment.sh)

[ste7en]

Maybe it's worth to consider moving this variable to .xcode.env generating script (with-environment.sh)

Yes @mefjuu, I agree it would be a much cleaner solution