#11 [8] Implement containerised pipeline steps

Contaierised pipeline steps using Docker containers should be implemented to decouple software requirements of each step and actual pipeline execution system. There should be a read-only ```input``` volume containing all requirements and a writable ```output``` volume linking to the pipeline step target directory. References: https://docs.docker.com/storage/volumes/ https://stackoverflow.com/questions/42625947/docker-input-output-outside-the-container