Plone front end Docker image start error

I'm trying to use GitHub - plone/plone-frontend: Plone frontend Docker images using Node 14. as we did during the conference training, and which I repurposed for Plone In A Box™ successfully at plone-in-a-box/StackScript at main · collective/plone-in-a-box · GitHub

I am trying on Ubuntu 20.04 LTS, but am getting this error.

# docker run -p 3000:3000 plone/plone-frontend:latest start
  throw err;

Error: Cannot find module '/app/start'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47 {
  requireStack: []

Looking at the example docker-compose.yml, I don't see what I am doing wrong:

Unless some underlying assumption about this Docker image has changed since October...