Implement minimal docker builds

Dockerfile

-FROM golang
-
+FROM golang as builder
 RUN curl https://glide.sh/get | sh
 
 WORKDIR /go/src/app
-COPY . .
+COPY glide.lock glide.yaml ./
 RUN glide install
-RUN go build -a app .
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -a app .
 
-ENTRYPOINT ["./app"]
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+FROM scratch
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /go/src/app/app /app
+ENTRYPOINT ["/app"]
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