Fix detection of GHA

Author: RealCLanger

test/jdk/tools/jlink/plugins/AddSapMachineToolsTest.java

@@ -59,11 +59,16 @@ public class AddSapMachineToolsTest {
 
     @Test
     public void testSapMachineTools() throws IOException {
-        // async profiler is only available on restricted set of platforms and not in Github Actions builds
-        String gha = System.getenv("GITHUB_ACTIONS");
-        boolean shouldHaveAsync = (gha == null || !gha.contains("true")) &&
-                (Platform.isOSX() ||
-                 (Platform.isLinux() && (Platform.isAArch64() || Platform.isPPC() || Platform.isX64()) && !Platform.isMusl()));
+        // async profiler is not pulled in GHA builds, so skip the test there.
+        // checking whether we are in a GHA environment is hacky because jtreg removes environment variables,
+        // so we guess by checking for a user name containing the String "runner"
+        if (System.getProperty("user.name", "n/a").contains("runner")) {
+            throw new SkippedException("Detected a Github Actions environment. No tools get added to SapMachine here, so skip test.");
+        }
+
+        // async profiler is only available on a subset of platforms
+        boolean shouldHaveAsync = Platform.isOSX() ||
+                (Platform.isLinux() && (Platform.isAArch64() || Platform.isPPC() || Platform.isX64()) && !Platform.isMusl());
 
         Path sourceJavaHome = Path.of(System.getProperty("java.home"));