Add dockerfile which will build the linux binary

Dockerfile

@@ -0,0 +1,24 @@
+FROM ubuntu:16.04
+
+RUN apt-get update && apt-get upgrade
+RUN apt-get install -y python3-pip python3-crypto libsnappy-dev
+RUN apt-get install -y zip
+
+RUN mkdir -p /syncrypt
+ADD ./syncrypt /syncrypt/syncrypt
+ADD ./scripts /syncrypt/scripts
+ADD ./dist-files /syncrypt/dist-files
+ADD ./setup.cfg /syncrypt/
+ADD ./setup.py /syncrypt/
+ADD ./README.md /syncrypt/
+
+RUN pip3 install -e '/syncrypt[dist]'
+
+WORKDIR /syncrypt
+
+ADD ./syncrypt.spec /syncrypt/syncrypt.spec
+RUN mkdir -p /syncrypt/dist
+VOLUME /syncrypt/dist
+
+CMD python3 setup.py dist
+