Add k8s-ci-builder image to support Kubernetes builds in CI

Signed-off-by: Stephen Augustus <[email protected]>

Author: justaugustus

images/releng/k8s-ci-builder/Dockerfile

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+# Copyright 2019 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.
+
+ARG GO_VERSION
+ARG KUBE_CROSS_VERSION
+FROM golang:${GO_VERSION} as builder
+
+WORKDIR /go/src/k8s.io/release
+
+COPY ./ ./
+
+RUN ./compile-release-tools
+
+### Production image
+
+FROM gcr.io/k8s-staging-releng/k8s-cloud-builder:${KUBE_CROSS_VERSION}
+
+WORKDIR /
+COPY --from=builder /go/bin/* ./
+
+ENTRYPOINT ["/krel"]

images/releng/k8s-ci-builder/cloudbuild.yaml

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+# See https://cloud.google.com/cloud-build/docs/build-config
+timeout: 1200s
+options:
+  substitution_option: ALLOW_LOOSE
+steps:
+  - name: gcr.io/cloud-builders/docker
+    id: build
+    dir: images/releng/k8s-ci-builder
+    args:
+    - build
+    - --tag=gcr.io/$PROJECT_ID/k8s-ci-builder:${_GIT_TAG}-${_CONFIG}
+    - --tag=gcr.io/$PROJECT_ID/k8s-ci-builder:latest-${_CONFIG}
+    - --tag=gcr.io/$PROJECT_ID/k8s-ci-builder:${_KUBE_CROSS_VERSION}
+    - --build-arg=GO_VERSION=${_GO_VERSION}
+    - --build-arg=KUBE_CROSS_VERSION=${_KUBE_CROSS_VERSION}
+    - -f ./Dockerfile
+    - ../../../.
+
+substitutions:
+  # _GIT_TAG will be filled with a git-based tag for the image, of the form vYYYYMMDD-hash, and
+  # can be used as a substitution
+  _GIT_TAG: '12345'
+  _PULL_BASE_REF: 'dev'
+  _CONFIG: 'cross0.0'
+  _GO_VERSION: '0.0.0'
+  _KUBE_CROSS_VERSION: 'v0.0.0-0'
+
+images:
+  - 'gcr.io/$PROJECT_ID/k8s-ci-builder:${_GIT_TAG}-${_CONFIG}'
+  - 'gcr.io/$PROJECT_ID/k8s-ci-builder:latest-${_CONFIG}'
+  - 'gcr.io/$PROJECT_ID/k8s-ci-builder:${_KUBE_CROSS_VERSION}'
+
+tags:
+- 'k8s-ci-builder'
+- ${_GIT_TAG}
+- ${_PULL_BASE_REF}
+- ${_GO_VERSION}
+- ${_KUBE_CROSS_VERSION}

images/releng/k8s-ci-builder/variants.yaml

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+variants:
+  cross1.15:
+    CONFIG: 'cross1.15'
+    GO_VERSION: '1.15.3'
+    KUBE_CROSS_VERSION: 'v1.15.3-1'