The `node` versioning scheme does only use LTS by default, which we
want. So we need to apply that for the Docker tags of node.js images.
NPM packages should use the appropriate versioning scheme as well.
Many dependencies are installed manually within the Dockerfiles,
where Renovate cannot determine the version numbers by default.
However, through custom matching, the corresponding data sources
can be invoked, and the version number replaced via regex.
