failed to parse platform

[aniota]

Hi, i tried to run a nodebb via docker but i got error
i used https://docs.nodebb.org/installing/cloud/docker/

root@minifast:~/docker/NodeBB-3.6.1# docker-compose --profile redis up
Building nodebb
Sending build context to Docker daemon  17.68MB
Step 1/25 : FROM --platform=$BUILDPLATFORM node:lts as npm
failed to parse platform : "" is an invalid component of "": platform specifier component must match "^[A-Za-z0-9_-]+$": invalid argument
ERROR: Service 'nodebb' failed to build : Build failed
root@minifast:~/docker/NodeBB-3.6.1#