Some updates proposed to your repository

[emverdes]

Hello, I've been using your proyect for some time in my teaching of containers, and over time I've been doing some changes to keep it current, so, if you like them, can merge them to your proyect.

I've changed from Dockerfile to Container file, and expanded the instructions in the README to use podman instead of docker. Also, updated the Containerfile to use Centos Steam 9, OpenJDK 11 and the latest release of Tomcat 8.

Also included instructions to create a second container and add Load Balancing and reverse proxy to Apache.

Best regards,

Enrique Verdes