Add Dockerfile

Dockerfile

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+FROM ubuntu:trusty
+MAINTAINER Paul Bowsher <paul.bowsher@gmail.com>
+
+RUN apt-get update
+RUN apt-get install -y sqlite3 libsqlite3-dev git build-essential
+RUN apt-get install -y ruby-dev libssl-dev
+RUN apt-get install -y nodejs
+
+RUN gem install bundler --no-ri --no-rdoc
+
+ADD . /app
+WORKDIR /app
+
+RUN bundle install
+RUN bundle exec rake assets
+
+EXPOSE 1025
+EXPOSE 1080
+
+ENTRYPOINT ["bundle", "exec", "mailcatcher", "--ip", "0.0.0.0", "-f"]