Merge pull request #10 from chai2010/master

add bash for alpine dockerfile

Author: chilianyi

Dockerfile.build.alpine

@@ -1,6 +1,6 @@
 FROM golang:1.10.2-alpine
 
-RUN apk add --no-cache make git
+RUN apk add --no-cache make git bash
 RUN mkdir -p /go/src/github.com/kelseyhightower/confd && \
   ln -s /go/src/github.com/kelseyhightower/confd /app