Initial mailman core docker container

core/Dockerfile

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+FROM python:3.5
+
+MAINTAINER Abhilash Raj
+
+# Install the latest master branch of the mailman directly
+# from the Gitlab.
+RUN pip install git+https://gitlab.com/mailman/mailman.git
+
+ADD assets/run.sh /opt/run.sh
+
+# Pidproxy is our sort-of process watcher that sends any
+# signal that it receives to the mailman's master process.
+ADD assets/pidproxy.py /opt/pidproxy.py
+
+# Change the working directory.
+WORKDIR /opt/mailman
+
+CMD /opt/run.sh