Create docker image and services

As hinted by the previous commit, the mailnode system is built in a
single docker image for simplicity.  Defining multiple Dockerfiles would
lead to many redundant tasks and be harder to maintain.  So a common
image for all services is built.

However, the compose file spawns a unique container for each service,
and communication occurs via the filesystem, through volumes.  Note also
that some fields in docker-compose.yml are required to be set by the
end-user.

The mail system is oriented around virtual users, so that nobody needs
their own unix system account.  However, best security practice is to
create a dedicated user to own the mails - this user shouldn't be used
for any other purpose.  For this, the Dockerfile creates the user
"vmailbox".

The reason for declaring port exposure for TCP/80 is to enable automated
TLS encryption with nginx-proxy-acme.  This port is not actually opened
by the compose file.

Signed-off-by: Malfurious <m@lfurio.us>

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