Sorry I dont have the error at hand but container boostrap will crash on composer step 3 because of running container as root without COMPOSER_ALLOW_SUPERUSER="1" env variable.
You should update env variables documentation just in case.
I encountered the problem in my CI and other projects too. Apparently it is a new behavior from the latest composer version. I pushed a temporary fix, I'll see if I can find a better way to handle this.
Sorry I dont have the error at hand but container boostrap will crash on composer step 3 because of running container as root without COMPOSER_ALLOW_SUPERUSER="1" env variable.
You should update env variables documentation just in case.