Avoid reading user's global Git config

Author: marcphilipp

platform-tests/src/test/java/org/junit/platform/reporting/open/xml/OpenTestReportGeneratingListenerTests.java

@@ -280,6 +280,7 @@ private static ProcessResult tryExecGit(Path workingDir, String... arguments) th
 		System.out.println("$ git " + String.join(" ", arguments));
 		return new ProcessStarter() //
 				.executable(Path.of("git")) //
+				.putEnvironment("GIT_CONFIG_GLOBAL", "/dev/null") // https://git-scm.com/docs/git#Documentation/git.txt-GITCONFIGGLOBAL
 				.workingDir(workingDir) //
 				.addArguments(arguments) //
 				.startAndWait();