Move Dockerfile to go 1.9.1 (#5047)

Additionally add Dockerfile.dev to build local development images.

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM golang:1.9.1-alpine3.6
 
 MAINTAINER Minio Inc <dev@minio.io>
 
@@ -12,7 +12,7 @@ COPY dockerscripts/docker-entrypoint.sh dockerscripts/healthcheck.sh /usr/bin/
 
 RUN  \
      apk add --no-cache ca-certificates curl && \
-     apk add --no-cache --virtual .build-deps git go musl-dev && \
+     apk add --no-cache --virtual .build-deps git && \
      echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \
      go get -v -d github.com/minio/minio && \
      cd /go/src/github.com/minio/minio && \

Dockerfile.dev

@@ -0,0 +1,32 @@
+FROM golang:1.9.1-alpine3.6
+
+MAINTAINER Minio Inc <dev@minio.io>
+
+ENV GOPATH /go
+ENV PATH $PATH:$GOPATH/bin
+ENV CGO_ENABLED 0
+
+WORKDIR /go/src/github.com/minio/
+
+COPY dockerscripts/docker-entrypoint.sh dockerscripts/healthcheck.sh /usr/bin/
+
+COPY . /go/src/github.com/minio/minio
+
+RUN  \
+     apk add --no-cache ca-certificates curl && \
+     apk add --no-cache --virtual .build-deps git && \
+     echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \
+     cd /go/src/github.com/minio/minio && \
+     go install -v -ldflags "$(go run buildscripts/gen-ldflags.go)" && \
+     rm -rf /go/pkg /go/src /usr/local/go && apk del .build-deps
+
+EXPOSE 9000
+
+ENTRYPOINT ["/usr/bin/docker-entrypoint.sh"]
+
+VOLUME ["/export"]
+
+HEALTHCHECK --interval=30s --timeout=5s \
+    CMD /usr/bin/healthcheck.sh
+
+CMD ["minio"]