build docker image with google container builder (#68)

* chore: build docker image with google container builder

* chore: add boilerplate header

Dockerfile

+# Copyright 2017 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.
+
+FROM alpine:3.5
+
+COPY build/linux-amd64/external-dns /external-dns
+
+ENTRYPOINT ["/external-dns"]

Makefile

@@ -36,4 +36,23 @@ test:
 verify: test
 	vendor/github.com/kubernetes/repo-infra/verify/verify-boilerplate.sh --rootdir=${CURDIR}
 	vendor/github.com/kubernetes/repo-infra/verify/verify-go-src.sh -v --rootdir ${CURDIR}
-	
+
+# The build targets allow to build the binary and docker image
+.PHONY: build build.docker
+
+PROJECT   ?= zalando-docker
+BINARY    ?= external-dns
+SOURCES    = $(shell find . -name '*.go')
+IMAGE     ?= gcr.io/$(PROJECT)/$(BINARY)
+VERSION   ?= $(shell git describe --tags --always --dirty)
+
+build: build/$(BINARY)
+
+build/$(BINARY): $(SOURCES)
+	CGO_ENABLED=0 go build -o build/$(BINARY) .
+
+build.docker: build/linux-amd64/$(BINARY)
+	docker build --rm --tag "$(IMAGE):$(VERSION)" .
+
+build/linux-amd64/$(BINARY): $(SOURCES)
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o build/linux-amd64/$(BINARY) .

cloudbuild.yaml

+steps:
+- name: gcr.io/cloud-builders/go
+  args:
+  - build
+  - -o=build/linux-amd64/external-dns
+  - .
+  env:
+  - PROJECT_ROOT=github.com/kubernetes-incubator/external-dns
+- name: gcr.io/cloud-builders/docker
+  args:
+  - build
+  - --tag=gcr.io/$PROJECT_ID/external-dns
+  - .
+
+images:
+- gcr.io/$PROJECT_ID/external-dns