make: Add some useful targets to the Makefile
make: Add some useful targets to the Makefile

I personally find I'm usually building all of the containers and
pushing all of the containers.  This target makes that slightly more
convenient.

PenguinToast/quilt,NetSys/quilt,mmussomele/quilt,NetSys/quilt,secant/quilt,LuiseV/quilt,ejj/quilt-dev,stevenlin598/quilt,quilt/quilt,stevenlin598/quilt,mmussomele/quilt,tejasmanohar/quilt,stevenlin598/quilt,kelda/kelda,stevenlin598/quilt,kklin/kelda,akshayknarayan/quilt,secant/quilt,ejj/quilt-dev,ZhongtianWang/quilt,PenguinToast/quilt,mmussomele/quilt,LuiseV/quilt,secant/quilt,NetSys/quilt,akshayknarayan/quilt,LuiseV/quilt,mmussomele/quilt,secant/quilt,stevenlin598/quilt,NetSys/quilt,akshayknarayan/quilt,secant/quilt,ZhongtianWang/quilt,PenguinToast/quilt,kklin/kelda,mmussomele/quilt,kelda/kelda,tejasmanohar/quilt,quilt/quilt,kklin/quilt,kklin/quilt,kklin/kelda,LuiseV/quilt,quilt/quilt,akshayknarayan/quilt,kklin/quilt,ZhongtianWang/quilt,kayousterhout/quilt,tejasmanohar/quilt,stevenlin598/quilt,ejj/quilt-dev,kklin/kelda,PenguinToast/quilt,ejj/quilt-dev,mmussomele/quilt,LuiseV/quilt,kayousterhout/quilt,quilt/quilt,kayousterhout/quilt,NetSys/quilt,kklin/quilt,kelda/kelda,PenguinToast/quilt,ZhongtianWang/quilt,kelda/kelda,tejasmanohar/quilt,kayousterhout/quilt