update Dockerfile

Dockerfile

@@ -1,15 +1,26 @@
-FROM golang:1.9.2
+FROM golang:alpine as build
+ENV GO111MODULE=on
+ENV CGO_ENABLED=0
+ENV GOOS=linux
+
+RUN apk add --no-cache make git
+
 WORKDIR /go/src/github.com/netlify/gotrue
-COPY . /go/src/github.com/netlify/gotrue/
+COPY . /go/src/github.com/netlify/gotrue
+
+RUN ls -al
 RUN make deps build
+RUN go build -a -installsuffix cgo -o gotrue
+
 
 FROM alpine:3.7
+RUN adduser -D -u 1000 netlify
+
 RUN apk add --no-cache ca-certificates
-RUN adduser -D -u 1000 netlify && mkdir /lib64 && ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2
-COPY --from=0 /go/src/github.com/netlify/gotrue/gotrue /usr/local/bin/gotrue
-COPY --from=0 /go/src/github.com/netlify/gotrue/migrations /usr/local/etc/gotrue/migrations/
-RUN chown netlify:netlify /usr/local/bin/gotrue && chown -R netlify:netlify /usr/local/etc/gotrue
+COPY --from=build /go/src/github.com/netlify/gotrue/gotrue /usr/local/bin/gotrue
+COPY --from=build /go/src/github.com/netlify/gotrue/migrations /usr/local/etc/gotrue/migrations/
 
-USER netlify
 ENV GOTRUE_DB_MIGRATIONS_PATH /usr/local/etc/gotrue/migrations
-CMD ["gotrue"]
+
+USER netlify
+CMD ["gotrue"]