fix failed tests are depends on external container images

api/krusty/fnplugin_test.go

@@ -504,8 +504,7 @@ func skipIfNoDocker(t *testing.T) {
 }
 
 func TestFnContainerGenerator(t *testing.T) {
-	t.Skip("armarchitecture")
-	//https://docs.docker.com/engine/reference/commandline/build/#git-repositories
+	t.Skip("it may failed by arm architecture")
 	skipIfNoDocker(t)
 	th := kusttest_test.MakeHarness(t)
 	o := th.MakeOptionsPluginsEnabled()
@@ -613,6 +612,7 @@ metadata:
 
 func TestFnContainerTransformerWithConfig(t *testing.T) {
 	skipIfNoDocker(t)
+	//https://docs.docker.com/engine/reference/commandline/build/#git-repositories
 	build := exec.Command("docker", "build", "https://github.com/GoogleContainerTools/kpt-functions-sdk.git#go-sdk-v0.0.1:ts/hello-world",
 		"-f", "build/label_namespace.Dockerfile",
 		"-t", "gcr.io/kpt-functions/label-namespace:go-sdk-v0.0.1",