Commented Dockerfile, added .dockerignore

.dockerignore

@@ -0,0 +1,2 @@
+Dockerfile
+Vagrantfile

Dockerfile

@@ -1,26 +1,35 @@
 FROM ubuntu:14.04
 
+# Install dependencies
 RUN apt-get update -y
 RUN apt-get install -y openssl python-imaging python-jinja2 python-lxml libxml2-dev libxslt1-dev python-pgpdump
 
+# Add code
 WORKDIR /Mailpile
 ADD . /Mailpile
 
-RUN	groupadd -r mailpile \
-&&  mkdir -p /mailpile-data/.gnupg \
-&&	useradd -r -d /mailpile-data -g mailpile mailpile
+# Create users and groups
+RUN groupadd -r mailpile \
+    && mkdir -p /mailpile-data/.gnupg \
+    && useradd -r -d /mailpile-data -g mailpile mailpile
 
+# Add GnuPG placeholder file
 RUN touch /mailpile-data/.gnupg/docker_placeholder
 
+# Fix permissions
 RUN chown -R mailpile:mailpile /Mailpile
 RUN chown -R mailpile:mailpile /mailpile-data
 
+# Run as non-privileged user
 USER mailpile
 
+# Initialize mailpile
 RUN ./mp setup
 
+# Entrypoint
 CMD ./mp --www=0.0.0.0:33411 --wait
 EXPOSE 33411
 
+# Volumes
 VOLUME /mailpile-data/.local/share/Mailpile
 VOLUME /mailpile-data/.gnupg