build: Enable kube-cross push/pull from K8s Infra GCR

- Search/replace Google Infra kube-cross locations for K8s Infra
- Update kube-cross make targets
  - Don't attempt to pre-pull image (docker build --pull)
    This prevents CI failures when the image under test doesn't exist
    yet in the registry.
  - 'make all' now builds and pushes the kube-cross image
  - Allow 'TAG' to be specified via env var
  - Use 'KUBE_CROSS_VERSION' to represent the kube-cross version
  - Tag kube-cross images with both a kubernetes version
    ('git describe') and a kube-cross version
- Add a GCB (Google Cloud Build) config file (cloudbuild.yaml)

Signed-off-by: Stephen Augustus <saugustus@vmware.com>

build/build-image/Dockerfile

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # This file creates a standard build environment for building Kubernetes
-FROM k8s.gcr.io/kube-cross:KUBE_BUILD_IMAGE_CROSS_TAG
+FROM us.gcr.io/k8s-artifacts-prod/build-image/kube-cross:KUBE_BUILD_IMAGE_CROSS_TAG
 
 # Mark this as a kube-build container
 RUN touch /kube-build-image

build/build-image/cross/Makefile

@@ -14,15 +14,22 @@
 
 .PHONY:	build push
 
-REGISTRY?=staging-k8s.gcr.io
-IMAGE=$(REGISTRY)/kube-cross
-TAG=$(shell cat VERSION)
+STAGING_REGISTRY?=gcr.io/k8s-staging-build-image
+PROD_REGISTRY?=us.gcr.io/k8s-artifacts-prod/build-image
+IMAGE=kube-cross
 
+TAG?=kubernetes-$(shell git describe --tags --match='v*' --abbrev=14)
+KUBE_CROSS_VERSION=$(shell cat VERSION)
 
-all: push
+all: build push
 
 build:
-	docker build --pull -t $(IMAGE):$(TAG) .
+	docker build \
+		-t $(STAGING_REGISTRY)/$(IMAGE):$(TAG) \
+		-t $(STAGING_REGISTRY)/$(IMAGE):$(KUBE_CROSS_VERSION) \
+		-t $(PROD_REGISTRY)/$(IMAGE):$(KUBE_CROSS_VERSION) \
+		.
 
-push: build
-	docker push $(IMAGE):$(TAG)
+push:
+	docker push $(STAGING_REGISTRY)/$(IMAGE):$(TAG)
+	docker push $(STAGING_REGISTRY)/$(IMAGE):$(KUBE_CROSS_VERSION)

build/build-image/cross/cloudbuild.yaml

@@ -0,0 +1,13 @@
+# See https://cloud.google.com/cloud-build/docs/build-config
+timeout: 1200s
+options:
+  substitution_option: ALLOW_LOOSE
+steps:
+  - name: 'gcr.io/k8s-testimages/gcb-docker-gcloud:v20191019-6567e5c'
+    entrypoint: make
+    env:
+    - DOCKER_CLI_EXPERIMENTAL=enabled
+    args:
+    - all
+images:
+  - 'gcr.io/$PROJECT_ID/kube-cross:kubernetes-${_GIT_TAG}'