Dev Container npm/node issues

[Trequetrum]

When I clone the GameSkeleton template and then start a Dev Container in Vs Code, I get the following error:

> [email protected] start
> concurrently -n server,client -c blue,green "npm run start_server" "npm run start_client"

sh: 1: concurrently: not found

Attempting to update npm and node in order to install concurrently:

npm WARN tarball tarball data for lean4@[...] seems to be corrupted. Trying again.
...
npm ERR! code 1
npm ERR! git dep preparation failed

I don't have a lot of experience with Docker and Web Stack stuff, but I can't get this off the ground anymore. Any suggestions?