PCCS service does not run automatically in docker container

[dcmiddle]

The verification environment dockerfile (docker/verifier-env) is written to have the PCCS service running but it always has to be manually launched in the container.

Possible solutions are to correct the dockerfile or command line usage (see run-docker-verifier script); explore alternative ways to start the container and the service through docker-compose; or pull the PCCS service out of the node management service (PM2) and rely directly on docker.