local: disable unreliable test

In this commit we merged an unreliable test

e053c8a1c0 copy: fix nil pointer dereference when corrupted on transfer with nil dst

It is a good idea but very hard to implement so it always works.

Hence this disables it for the moment.

backend/local/local_internal_test.go

@@ -79,6 +79,7 @@ func TestUpdatingCheck(t *testing.T) {
 // Test corrupted on transfer
 // should error due to size/hash mismatch
 func TestVerifyCopy(t *testing.T) {
+	t.Skip("FIXME this test is unreliable")
 	r := fstest.NewRun(t)
 	filePath := "sub dir/local test"
 	r.WriteFile(filePath, "some content", time.Now())