Multi stage build (#20)

* Introduce docker multi-stage build

* Whitelist files in .dockerignore

* Use alias for first stage in dockerfile

.dockerignore

@@ -1,2 +1,7 @@
-flink-sample-job/
+# Exclude everything
+**
+
+# Whitelist
+!cmd
+!vendor
 !flink-sample-job/target/

Dockerfile

@@ -1,10 +1,11 @@
-FROM alpine:3.8
-
-COPY cli /flink-deployer/cli
+FROM golang:1.10.4-alpine3.8 as build
+WORKDIR /go/src/github.com/ing-bank/flink-deployer/
+COPY . .
+RUN go build ./cmd/cli
 
+FROM alpine:3.8
 WORKDIR /flink-deployer
-
+COPY --from=build /go/src/github.com/ing-bank/flink-deployer/cli .
 VOLUME [ "/data/flink" ]
-
 ENTRYPOINT [ "/flink-deployer/cli" ]
 CMD [ "help" ]

README.md

@@ -21,7 +21,7 @@ For a full overview of the commands and flags, run `flink-job-deployer help`
 
 To be able to test the deployer locally, follow these steps:
 
-1. Build the CLI tool: `env GOOS=linux GOARCH=amd64 go build ./cmd/cli && docker-compose build deployer`
+1. Build the CLI tool docker image: `docker-compose build deployer`
 2. ***optional***: `cd flink-sample-job; sbt clean assembly; cd ..` (Builds a jar with small stateful test job)
 3. `docker-compose up -d jobmanager taskmanager` (start a Flink job- and taskmanager)
 4. `docker-compose run deployer help` (run the Flink deployer with argument `help`)
@@ -79,7 +79,6 @@ env GOOS=linux GOARCH=amd64 go build ./cmd/cli
 Build the Docker container locally to test CLI tool:
 
 ```bash
-go build ./cmd/cli
 docker-compose build deployer
 ```