Docker Plugin Development

I’m trying to do some WordPress plugin development including Gutenberg blocks by completely containerising things so I’m not polluting my host system. Ideally this one mean…

Hosting WordPress in a container (I can get this working)

Mounting a local ‘plugin’ folder as a volume (also fine)

Installing the necessary command lines to be able to execute NPM start, etc when building using ESNext, from within the container shell (this is where I get stuck)

I’m very new to Docker, so I’m probably just doing something stupid – but equally I don’t seem to be able to find a clear tutorial / docker-compose template which is up to date with the latest wordpress approach. Any guidance/signposts very welcome…