Experimental: Docker

[Z2l0aHViLXVzZXIK]

Thank you for VRipper. I notice you often support users' Java issues. This may help you and them.

Just a start.

• Dockerfile for building VRipper Server app as a Docker image.
• docker-compose.yml for running VRipper Server app image as a Docker container.

Future, if @death-claw wishes:

• Run VRipper in container as non-root user.
• Resolve non-root user file permissions.
• Automatically build and tag a Docker image for each tagged version of VRipper.
• Push images to the GitHub Packages Docker registry.
• Write end-user instructions for running images pulled from GitHub registry.