Decided to launch a new dev instance from scratch, and it seems we've changed the base directory for the password file at creation.
Meaning make show-passwords doesn't work anymore :
show-passwords: ## Display passwords generated for Docker Compose environment
@$(DOCKER_COMPOSE) exec web cat /data/root/.tuleap_passwd
[nix-shell:~/tuleap]$ make show-passwords
cat: /data/root/.tuleap_passwd: No such file or directory
make: *** [Makefile:327: show-passwords] Error 1
The file exists however in /root/.tuleap_passwd as in any RPM instance