Puts Maven Central as the first repository
Puts Maven Central as the first repository

This speeds up the build A LOT when none of the dependencies have been
cached yet (e.g. when performing a docker build). Reason: without putting this repository first, all
dependencies are first searched in all of the specified repositories and
only afterwards the central repository is tried. Because most
dependencies are not present in the specified repositories, still
central needs to be queried afterwards. When putting the central
repository first, this reduces time to retrieve dependencies in two
ways:

1. The central repository has a very low latency, much lower than the
other repositories. If a dependency can be fetched from here, it will be
faster than when it is fetched from another one.
2. For most dependencies, it reduces the number of repositories queried
from 7 to 1.

OHDSI/WebAPI,OHDSI/WebAPI,OHDSI/WebAPI