Docker version of jinja2-cli.
You can build this image like this:
docker build -t vikingco/jinja2cli .
Say you have a template called template.j2 and a YAML file called data.yml.
$ cat template.j2
{{ title }}
$ cat data.yml
title: My Title
Then you can render this template by executing
$ docker run -v $(pwd):/data vikingco/jinja2cli template.j2 data.yml > out
$ cat out
My Title