On Ubuntu 22.04.5 LTS (WSL), the "docker compose up" step fails.

Cause seems to be that script uses bash syntax incompatible with the currently set interpreter (/bin/sh). A fix would be to change the shebang line to explicitly use bash. Alternatively, could rewrite the script to be POSIX-compliant so the current shebang works.
I can create a pull for this, if desired.