public Planetiler addGeoPackageSource(String name, Path defaultPath, String defaultUrl) {
    return addGeoPackageSource(null, name, defaultPath, defaultUrl);
  }
Adds a new OGC GeoPackage source that will be processed when {@link #run()} is called.
<p>
If the file does not exist and {@code download=true} argument is set, then the file will first be downloaded from
{@code defaultUrl}.
<p>
To override the location of the {@code geopackage} file, set {@code name_path=newpath.gpkg} in the arguments and to
override the download URL set {@code name_url=http://url/of/file.gpkg}.
<p>
If given a path to a ZIP file containing one or more GeoPackages, each {@code .gpkg} file within will be extracted
to a temporary directory at runtime.

@param name        string to use in stats and logs to identify this stage
@param defaultPath path to the input file to use if {@code name_path} key is not set through arguments
@param defaultUrl  remote URL that the file to download if {@code download=true} argument is set and
                   {@code name_url} argument is not set
@return this runner instance for chaining
@see GeoPackageReader
@see Downloader
planetiler-core/src/main/java/com/onthegomap/planetiler/Planetiler.java