add Dockerfile optimizations (#613)
add Dockerfile optimizations (#613)


geopython/pycsw,kalxas/pycsw,tomkralidis/pycsw,bukun/pycsw,ricardogsilva/pycsw,bukun/pycsw,tomkralidis/pycsw,kalxas/pycsw,tomkralidis/pycsw,kalxas/pycsw,ricardogsilva/pycsw,geopython/pycsw,bukun/pycsw,ricardogsilva/pycsw,geopython/pycsw