test/e2e: do not leak "hello" file

Because the test mounts the current dir it does not need to create a new
file in it. Just check if the current test file is there should fulfill
the same purpose.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

test/e2e/run_volume_test.go

@@ -676,13 +676,9 @@ VOLUME /test/`, ALPINE)
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
 
-		// Test overlay mount when lowerdir is relative path.
-		f, err = os.Create("hello")
-		Expect(err).ToNot(HaveOccurred(), "os.Create")
-		f.Close()
 		session = podmanTest.Podman([]string{"run", "--rm", "-v", ".:/app:O", ALPINE, "ls", "/app"})
 		session.WaitWithDefaultTimeout()
-		Expect(session.OutputToString()).To(ContainSubstring("hello"))
+		Expect(session.OutputToString()).To(ContainSubstring(filepath.Base(CurrentGinkgoTestDescription().FileName)))
 		Expect(session).Should(Exit(0))
 
 		// Make sure modifications in container do not show up on host