I've seen bin/setup before, but it's not common for me to see it in use in CI. That's amazing and it's a good way to ensure it's up to date.
With that said, I'm still skeptical about running a 100-line script on my system, especially for open source projects. I feel it might be better to optimise to simplify the bootstrap process into recognisable commands (docker compose up && yarn && yarn dev
).