Add new multi-stage slim Dockerfile (#154)

Dockerfile

@@ -1,15 +1,26 @@
-FROM golang:alpine
+FROM golang:alpine3.8 AS build
+
+COPY . /go/src/github.com/andreimarcu/linx-server
+WORKDIR /go/src/github.com/andreimarcu/linx-server
 
 RUN set -ex \
         && apk add --no-cache --virtual .build-deps git \
-        && go get github.com/andreimarcu/linx-server \
+        && go get -v . \
         && apk del .build-deps
 
+FROM alpine:3.8
+
+COPY --from=build /go/bin/linx-server /usr/local/bin/linx-server
+
+ENV GOPATH /go
+COPY static /go/src/github.com/andreimarcu/linx-server/static/
+COPY templates /go/src/github.com/andreimarcu/linx-server/templates/
+
 RUN mkdir -p /data/files && mkdir -p /data/meta && chown -R 65534:65534 /data
 
 VOLUME ["/data/files", "/data/meta"]
 
 EXPOSE 8080
 USER nobody
-ENTRYPOINT ["/go/bin/linx-server", "-bind=0.0.0.0:8080", "-filespath=/data/files/", "-metapath=/data/meta/"]
+ENTRYPOINT ["/usr/local/bin/linx-server", "-bind=0.0.0.0:8080", "-filespath=/data/files/", "-metapath=/data/meta/"]
 CMD ["-sitename=linx", "-allowhotlink"]