Build and publish Docker image in circleci pipeline (#67)

Fixes #57

.circleci/config.yml

@@ -45,6 +45,27 @@ jobs:
       - restore_cache:
           key: vendor-{{ checksum "Gopkg.lock" }}
       - run: go build -o machine-controller github.com/kubermatic/machine-controller/cmd/controller
+      - save_cache:
+          key: machine-controller-{{ .Revision }}
+          paths:
+            - machine-controller
+
+  publish:
+    docker:
+      - image: docker:stable
+    working_directory: /go/src/github.com/kubermatic/machine-controller
+    steps:
+      - restore_cache:
+          key: repo-{{ .Environment.CIRCLE_SHA1 }}
+      - restore_cache:
+          key: machine-controller-{{ .Revision }}
+      - setup_remote_docker
+      - run: apk update && apk add make bash git
+      - run: |
+          set -e
+          export GIT_TAG=$CIRCLE_TAG
+          docker login -u "${DOCKERHUB_USER}" -p "${DOCKERHUB_PASS}"
+          make docker-image-nodep
 
 workflows:
   version: 2
@@ -60,4 +81,10 @@ workflows:
       - build:
           requires:
             - install-dependencies
-
+      - publish:
+          requires:
+            - build
+          filters:
+            branches:
+              only:
+                - master

Makefile

@@ -1,3 +1,5 @@
+SHELL = /bin/bash
+
 REGISTRY ?= docker.io
 REGISTRY_NAMESPACE ?= kubermatic
 
@@ -19,7 +21,20 @@ machine-controller: $(shell find cmd pkg -name '*.go') vendor
 				github.com/kubermatic/machine-controller/cmd/controller
 
 docker-image: machine-controller
-	docker build -t $(IMAGE_NAME) .
+	make docker-image-nodep
 
-push: docker-image
+# This target exists because in our CI
+# we do not want to restore the vendor
+# folder for the push step, but we know
+# for sure it is not required there
+docker-image-nodep:
+	docker build -t $(IMAGE_NAME) .
 	docker push $(IMAGE_NAME)
+	if [[ -n "$(GIT_TAG)" ]]; then \
+		$(eval IMAGE_TAG = $(GIT_TAG)) \
+		docker build -t $(IMAGE_NAME) . && \
+		docker push $(IMAGE_NAME) && \
+		$(eval IMAGE_TAG = latest) \
+		docker build -t $(IMAGE_NAME) . ;\
+		docker push $(IMAGE_NAME) ;\
+	fi