Add NPM registry proxy

[lukasluecke]

https://verdaccio.org/docs/en/docker

To speed up installs

[lukasluecke]

First steps in feature/npm-registry-cache, needs further work due to several concerns:

• Lockfile includes registry URL -> how to handle CI / different environments? Maybe just shadow the NPM registry inside the DDE network?
• What happens if Lockfile references a resolved file, but the proxy doesn't have it cached yet?

[lukasluecke]

Maybe we could also use something like https://www.npmjs.com/package/npm-proxy-cache - not exactly the same use-case but same direction

[lukasluecke]

yarnpkg/yarn#5892

Seems like this will be included in Yarn v2 (Berry), and possibly not backported. Until then not sure how to proceed - except some hackery with string replacements, or just dynamic proxying.

[s4mpl3d]

Closing this issue as stale. If this is still a concern, please open a new issue