cgtracker_test: skip if test cannot mkdir

In GH runners, we get:

--- FAIL: TestCgTrackerMap (0.12s)
    cgtracker_test.go:73: '/sys/fs/cgroup' is cgroup v1
    cgtracker_test.go:81: failed to create test dir: mkdir /sys/fs/cgroup/cgtracker-test-1715271346: read-only file system

So it seems that we cannot execute the test there. Skip it for now.

Signed-off-by: Kornilios Kourtis <kornilios@isovalent.com>

pkg/cgtracker/test/cgtracker_test.go

@@ -78,7 +78,7 @@ func cgfsMkdirTemp(t *testing.T, cgfsPath string) string {
 	// create tempdir
 	dir, err := os.MkdirTemp(cgfsPath, "cgtracker-test-*")
 	if err != nil {
-		t.Fatalf("failed to create test dir: %s", err)
+		t.Skipf("skipping test, failed to create test dir: %s", err)
 	}
 	t.Cleanup(func() {
 		err := os.RemoveAll(dir)