Mainly used on Mac OS.
Due to a bug when restarting Postgres, it sometimes cannot start the process again - because a PID-file already exists. This script holds the routine for fixing this, found the solution here.
Sometimes when closing rails in a bad way, it holds port 3000.
This scripts lists the PIDs holding the port.
Valgrind doesn't run well on Mac OS, so Docker is used to create an ubuntu-environment.
This prepares the docker-valgrind setup to be able debug memory leaks.