Enable this image to inherit Shopware's production Docker image

[lasomethingsomething]

General plan is to use https://github.com/shopware/docker and add a -node-22 or -node-24 variant where nodejs is also added. Enables users to have exactly the same image for production and local. Also helps PaaS local setup.

Already done:

• Added Nodejs to our official docker image
• Tried out docker compose watch to ensure that it works for us
• Tried out docker performance issues on a low spec mac

WIP:

• Gathering feedback from Shopware QA about what they need from the setup
• Docs changes feat: be more opinionated with shopware setup shopware/docs#1910

Proposed business outcome: provide a Docker setup that "just works" and simplifies both internal and external setup, eliminating "it works on my machine" micro-specialization. Make it much easier to test locally.

[lasomethingsomething]

Moving conversation to shopware/docker#137