Patrick Hagemeister

This updates the base image to node:current-buster (node 16 on debian 10/buster). Also adds the linux dependencies required to operate headless chrome on debian 10/buster. Last but not least, `yarn...

Not sure whether locust changed this in recent versions, but your security group did not have ports 5557/5558 open, which is required for master/slave communication. This PR amends these two...