Cause debug to skip unmarshallable yamls (#3326)

pkg/skaffold/debug/debug.go

@@ -67,10 +67,8 @@ func applyDebuggingTransforms(l kubectl.ManifestList, retriever configurationRet
 	for _, manifest := range l {
 		obj, _, err := decodeFromYaml(manifest, nil, nil)
 		if err != nil {
-			return nil, errors.Wrap(err, "reading Kubernetes YAML")
-		}
-
-		if transformManifest(obj, retriever) {
+			logrus.Debugf("Unable to interpret manifest for debugging: %v\n", err)
+		} else if transformManifest(obj, retriever) {
 			manifest, err = encodeAsYaml(obj)
 			if err != nil {
 				return nil, errors.Wrap(err, "marshalling yaml")

pkg/skaffold/debug/debug_test.go

@@ -483,6 +483,28 @@ spec:
 status:
   replicas: 0`,
 		},
+		{
+			description: "skip unhandled yamls like crds",
+			shouldErr:   false,
+			in: `---
+apiVersion: openfaas.com/v1alpha2
+kind: Function
+metadata:
+  name: myfunction
+  namespace: openfaas-fn
+spec:
+  name: myfunction
+  image: myfunction`,
+			out: `---
+apiVersion: openfaas.com/v1alpha2
+kind: Function
+metadata:
+  name: myfunction
+  namespace: openfaas-fn
+spec:
+  name: myfunction
+  image: myfunction`,
+		},
 	}
 	for _, test := range tests {
 		testutil.Run(t, test.description, func(t *testutil.T) {