Dockerfile fixes/optimizations.

Dockerfile

@@ -1,11 +1,13 @@
-FROM golang:1.6
-
-RUN go get golang.org/x/tools/go/vcs
+FROM golang:1.6-alpine
 
 COPY . $GOPATH/src/github.com/gojp/goreportcard
 
 WORKDIR $GOPATH/src/github.com/gojp/goreportcard
 
-EXPOSE 8080
+RUN apk update && apk upgrade && apk add --no-cache git make \
+        && go get golang.org/x/tools/go/vcs \
+        && ./scripts/make-install.sh
+
+EXPOSE 8000
 
 CMD ["make", "start"]

scripts/make-install.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 go get github.com/alecthomas/gometalinter
 gometalinter --install --update