Dockerization: script run from within a container cannot access host's services (e.g., kernel planckster)

[alebg]

Currently, the README instructs to use the hack --net="host" for the docker run command, which is not OK. We should find a better way to have the scraper script connect to Kernel Planckster and MinIO when run from within a docker container.

Note that this is only an issue when the script is run from within a docker container. If executed as a standalone machine, no issues arise.