Modified moodlehq/moodle-php-apache image with self-signed certificates and Moodle Cron feature.

Updated version of `portainer/template-swarm-monitoring` registry

Random cats for fun: https://github.com/andisugandi/flask-cats

Modified moodlehq/moodle-php-apache image with self-signed certificates and Moodle Cron feature.

This Docker image was built based on tutorial at https://docs.docker.com/get-started/part2/