Is the docker image of mxnet/python:nightly_cpu_mkl_py3 built everyday?

I pulled the docker image of mxnet/python:nightly_cpu_mkl_py3 from https://hub.docker.com/r/mxnet/python/tags?page=1, and there’s a built-in mxnet in the container.
I’m wondering whether the mxnet version built in nightly_cpu_mkl_py3 is updated everyday?

The latest version of MXNet is compiled everyday and uploaded to PyPi. I assume they also upload it everyday to Dockerhub.