Do not cache outputs of compile tasks on EA versions of Java

Since new versions often introduce new compiler warnings that need to be
fixed.

Author: marcphilipp

buildSrc/src/main/kotlin/java-toolchain-conventions.gradle.kts

@@ -17,4 +17,7 @@ project.pluginManager.withPlugin("java") {
 	tasks.withType<JavaExec>().configureEach {
 		javaLauncher.set(javaToolchainService.launcherFor(extension.toolchain))
 	}
+	tasks.withType<JavaCompile>().configureEach {
+		outputs.cacheIf { javaLanguageVersion == defaultLanguageVersion }
+	}
 }