Add Dockerfile

This will build the binary directly in the image without a need to have
Go installed locally.

Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:alpine
+
+RUN set -ex \
+        && apk add --no-cache --virtual .build-deps git mercurial \
+        && go get github.com/andreimarcu/linx-server \
+        && apk del .build-deps
+
+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/"]
+CMD ["-sitename=linx", "-allowhotlink"]