Removes custom Docker lookup code and instead integrates it with the generic lookup routine used by other package managers. Logic for digest support was added but is used by Docker-only for now.
Closes#2081, Closes#2276
Manually finds and massages node updates in Docker, Docker Compose and Circle CI so that they should take on the same “renovate/node-8.x” style branch naming. The goal is to unify all node updates into a single branch.
Renovate now comes with a variety of package managers supported, each with their own filename pattern(s). These patterns are now exposed for user configuration through the new `fileMatch` list/array configuration option, which has been added to each manager (npm, bazel, docker-compose, etc). `fileMatch` is defined as a mergeable list, meaning that users can add to the default pattern to extend the files being detected.
Closes#799
Adds support for renovating Docker Compose files (e.g. `docker-compose.yml`). Functionality is essentially the same as the existing `Dockerfile` capabilities, so config for `docker` is shared with `docker-compose` but may also be overridden.
Merging as disabled by default - will wait for some opt-in testing before turning it on by default.
Closes#832
