move docker back to docker dir

[sbcgua]

revert #41 (and ensure it works :) ) and also adjust build.yml filters (as the repo name changed)

P.S. after current PRs are merged
P.P.S just in case "why": files at root levels makes it a bit cluttered, and may become more cluttered if more compose scenarios are introduced. E.g. abaplint+nginx+ssl certs

[sbcgua]

notes: jq '.dependencies."@abaplint/core".version' -r package-lock.json to extract version from package lock without installing all the deps

[larshp]

agree: should try to have less files at root level

[sbcgua]

improve todo:

• fix run/scripts
• add build&run script
• add cleanup script
• maybe link them to npm scripts (not sure, mixing things) ???

[sbcgua]

@larshp Are you using docker password or docker token as a secret ? Well, tokens are available now (I think it was not so before) - https://docs.docker.com/docker-hub/access-tokens/

[larshp]

tokens,