adding docker file for build container

Dockerfile

@@ -0,0 +1,12 @@
+FROM debian:sid
+
+MAINTAINER "toby" <toby@wit.com>
+
+RUN apt-get update && apt-get -y install curl gnupg ca-certificates
+
+RUN echo 'deb https://mirrors.wit.com/debian sid main contrib non-free' > /etc/apt/sources.list && \
+    echo 'deb https://mirrors.wit.com/debcore sid main' >> /etc/apt/sources.list && \
+    curl https://mirrors.wit.com/debcore/public.key | apt-key add - && \
+    apt-get update
+
+RUN apt-get -y install devscripts build-essential lintian debhelper config-package-dev && apt-get clean