Include package.json/package-lock.json in portal image
Include package.json/package-lock.json in portal image

This allows Trivy and other vulnerability scanners to correctly
determine the embedded dependencies in minified harbor-portal image.

Also simplify build process by reducing the number of layers in the
final stage container image

Signed-off-by: Dirk Mueller <a00b27378a09822d5638cdfb8c2e7ccc36d74c56@dmllr.de>

reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor,reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor,reasonerjt/harbor