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Since adding these to the `org.gradle.java.installations.fromEnv` property is problematic (#1024), this mechanism allows the default toolchains to be discovered by Gradle via a different mechanism. The default JDK installations are added to `~/.m2/toolchains.xml` such that they are discoverable by Gradle toolchain support. The `setup-java` action also writes to this file, so we merge with any existing content: this allows both pre-installed and "setup" JDKs to be automatically detected by Gradle.