Remove copyright year in generated code

Author: nojnhuh

Makefile

@@ -108,7 +108,7 @@ generate-deepcopy: vendor
 	for api in $(APIS); do \
 		rm -f $(CURDIR)/api/$(VENDOR)/resource/$${api}/zz_generated.deepcopy.go; \
 		controller-gen \
-			object:headerFile=$(CURDIR)/hack/boilerplate.go.txt,year=$(shell date +"%Y") \
+			object:headerFile=$(CURDIR)/hack/boilerplate.generatego.txt \
 			paths=$(CURDIR)/api/$(VENDOR)/resource/$${api}/ \
 			output:object:dir=$(CURDIR)/api/$(VENDOR)/resource/$${api}; \
 	done

api/example.com/resource/gpu/v1alpha1/zz_generated.deepcopy.go

@@ -0,0 +1,15 @@
+/*
+ * Copyright The Kubernetes Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */