Docker image for php 5.2 legacy projects

This docker image is intended to work as a replacement for old legacy projects, running on old server. The features are

• Based on Ubuntu 12.04
• Apache MPM Prefork
• PHP 5.2.17 as apache mod
• Zend Optimizer

NOTE: To enable mailing, you need to configure ssmtp. This can be done by adding a file ADD ssmtp.conf /etc/ssmtp/ containing a config like this

# See https://linux.die.net/man/5/ssmtp.conf
Mailhub=<Server>
AuthUser=<User>
AuthPass=<Pass>
Hostname=<Senders Host>
FromLineOverride=YES
UseTLS=YES
UseSTARTTLS=YES