Merge pull request #17 from krasi-georgiev/dockerfile

use multistage builds and build inside a container

.travis.yml

@@ -8,6 +8,9 @@ before_install:
   - go get github.com/mattn/goveralls
   - go get github.com/wadey/gocovmerge
 
+install:
+- go get -t ./...
+
 # Unconditionally place the repo at GOPATH/src/${go_import_path} to support
 # forks.
 go_import_path: github.com/m-lab/alertmanager-github-receiver

Dockerfile

@@ -1,9 +1,14 @@
-FROM golang:1.8
+FROM golang:1.10
 
-ADD . /go/src/github.com/m-lab/alertmanager-github-receiver
+WORKDIR /go/src/github.com/m-lab/alertmanager-github-receiver
+ADD . ./
 
-# TODO(soltesz): vendor dependencies.
-RUN go get -v github.com/m-lab/alertmanager-github-receiver/cmd/github_receiver
+# TODO(soltesz): Use vgo for dependencies.
+RUN CGO_ENABLED=0 go get -v github.com/m-lab/alertmanager-github-receiver/cmd/github_receiver
 
-# RUN go install -v
-ENTRYPOINT ["/go/bin/github_receiver"]
+FROM alpine
+RUN apk add --no-cache ca-certificates && \
+    update-ca-certificates
+WORKDIR /
+COPY --from=0 /go/bin/github_receiver ./
+ENTRYPOINT ["/github_receiver"]

Makefile

@@ -0,0 +1,3 @@
+docker:
+	@docker build -t $(DOCKER_TAG) .
+	@docker push $(DOCKER_TAG)

README.md

@@ -11,6 +11,12 @@ The alertmanager github receiver creates GitHub issues using
 [Alertmanager](https://github.com/prometheus/alertmanager) webhook
 notifications.
 
+# Build
+```
+make docker DOCKER_TAG=repo/imageName
+```
+This will build the binary and push it to repo/imageName.
+
 # Setup
 
 ## Create GitHub access token