Create Docker image and documentation

Docker images provide end users with an easy way to run PanTools on a number of infrastructures.

• Create a shell script or alias as entry point, providing configuration options through environment variables: 75b224d6
• Create documentation for end users on how to configure and run: 92afe159
• Decide on where to host the Docker image: DockerHub, GitLab, or somewhere else: WUR GitLab has publicly acccessible container registry. Will do.
• Pull in shaded jar or slim jar with dependencies instead of building from source, requires a fix for #21
• Fix system package versions in apt-get install: pending jar download to reduce number of dependencies
• Verify hash of miniconda installer
• Run Hadolint as pre-commit hook and in CI pipeline: b180517f
• Implement Hadolint recommendations: pending jar download to clean up Dockerfile