Goal: Eliminate extra noise and configuration in the Example setup and make it possible to write a "one-liner" bash install such as script for example (e.g. curl -sSL https://raw.githubusercontent.com/wikibase-releaase-pipeline/containers/main/example/try-wbs -- or similar)

Solution: Incorporate extra install files in Example directory into their correlated Docker images in a way that doesn't change their current function/API, but allows the Example configuration to be distributed without the extra files (e.g. extra-install.sh and jobrunner-entrypoint.sh). Possibly by using env var flags.