A container that generates Altair graphs for you, a wrapper for altair_saver, the missing piece of the trio.
Once run, it will monitor files in a folder for Vega specifications and generate PNG images.
There is no installation. But you need Docker.
git clone https://github.com/oguzhanogreden/deneb
cd deneb
docker build . -t deneb
In the directory where you'll save Vega specifications, simply:
docker run --volume="$PWD:/watch deneb /watch"