Improve development setup instructions about pkl HOT 4 OPEN

The Alpine executable depends on musl. You can see how we set it up in our CI here: https://github.com/apple/pkl/blob/main/.circleci/jobs/BuildNativeJob.pkl#L78-L90

But, if you just want to build it locally, you should be able to just do ./gradlew linuxExecutableAarch64 or ./gradlew linuxExecutableAmd64 depending on your architecture. But yeah, changing the build script to exclude the Alpine stuff works too!

For Gradle: I suppose that also implies setting up the JDK, but evidently enough you've already done that.

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Thanks for the pointers! I found more info here: https://www.graalvm.org/latest/reference-manual/native-image/guides/build-static-executables/#prerequisites-and-preparation

I think most (WSL) Linux users won't bother to set up a musl toolchain. But we'd still like to run the native build as advertised (./gradlew buildNative). How about only running the Alpine tasks if a musl toolchain (i.e., ~/staticdeps/bin/x86_64-linux-musl-gcc) is present? If this sounds good, I'll send a pull request.

For Gradle: I suppose that also implies setting up the JDK, but evidently enough you've already done that.

Setting up the JDK is mentioned separately. I think "Setup Gradle on your system" should be either detailed or removed.

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I think most (WSL) Linux users won't bother to set up a musl toolchain. But we'd still like to run the native build as advertised (./gradlew buildNative). How about only running the Alpine tasks if a musl toolchain (i.e., ~/staticdeps/bin/x86_64-linux-musl-gcc) is present? If this sounds good, I'll send a pull request.

That sounds good!

Setting up the JDK is mentioned separately. I think "Setup Gradle on your system" should be either detailed or removed

Feel free to submit a PR for this too (a separate one)

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Sent #83 for the musl toolchain check.

I'll leave it to you to clarify the "setup Gradle" instructions because I don't know if/what setup you'd like to recommend.
All I can say is that I didn't have to set up anything to build this project.

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