build: add container distribution

Dockerfile

@@ -0,0 +1,3 @@
+FROM alpine:3.4
+
+COPY dist/helmfile_linux_amd64 /helmfile

Makefile

@@ -33,6 +33,12 @@ release: pristine cross
 	@ghr -b ${BODY} -t ${GITHUB_TOKEN} -u ${ORG} -replace ${TAG} dist
 .PHONY: release
 
+image: cross
+	docker build -t quay.io/roboll/helmfile:${TAG} .
+
+push: image
+	docker push quay.io/roboll/helmfile:${TAG}
+
 tools:
 	go get -u github.com/roboll/ghr github.com/mitchellh/gox
 .PHONY: tools

README.md

@@ -2,6 +2,8 @@
 
 Deploy Kubernetes Helm Charts
 
+[![Docker Repository on Quay](https://quay.io/repository/roboll/helmfile/status "Docker Repository on Quay")](https://quay.io/repository/roboll/helmfile)
+
 ## about
 
 Helmfile is a declarative spec for deploying helm charts. It lets you...
@@ -32,7 +34,7 @@ charts:
 
 ## install
 
-`go get github.com/roboll/helmfile` or from [releases](https://github.com/roboll/helmfile/releases).
+`go get github.com/roboll/helmfile` or [releases](https://github.com/roboll/helmfile/releases) or [container](https://quay.io/roboll/helmfile)
 
 
 ## usage

circle.yml

@@ -28,4 +28,4 @@ deployment:
     tag: /v.*/
     commands:
       - cd "$WORK" && make tools
-      - cd "$WORK" && BUILD_URL="$CIRCLE_BUILD_URL" make release
+      - cd "$WORK" && BUILD_URL="$CIRCLE_BUILD_URL" make push release