Chart: Push to OCI registry. (#13695)

Co-authored-by: Marco Ebert <[email protected]>

Author: k8s-infra-cherrypick-robot

charts/Makefile

@@ -0,0 +1,30 @@
+# Copyright 2025 The Kubernetes Authors. All rights reserved.
+#
+# 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.
+
+NAME ?=
+
+REGISTRY ?= us-central1-docker.pkg.dev/k8s-staging-images/ingress-nginx
+REPOSITORY ?= $(REGISTRY)/charts
+
+.PHONY: helm
+helm:
+	command -v helm || go install helm.sh/helm/v3/cmd/helm@latest
+
+.PHONY: package
+package: helm
+	helm package $(NAME)
+
+.PHONY: push
+push: package
+	helm push $(NAME)-*.tgz oci://$(REPOSITORY)

charts/ingress-nginx/cloudbuild.yaml

@@ -0,0 +1,11 @@
+options:
+  # Ignore Prow provided substitutions.
+  substitution_option: ALLOW_LOOSE
+steps:
+- name: gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20250513-9264efb079
+  dir: charts
+  env:
+  - NAME=ingress-nginx
+  entrypoint: make
+  args:
+  - push