Is your feature request related to a problem? Please describe.
I am trying to setup a Docker-based validation process using bats. Our tests make use of bats-assert and bast-support, and those are not included in the bats/bats Docker image.

Describe the solution you'd like
Include all optional libraries in the Docker image. Alternatively, provide an additional image with those included, if adding more libraries to the base one is not desirable.

Describe alternatives you've considered
We considered building our own image, but having all libraries in the official Docker image is cleaner and has less potential of becoming stale.

Additional context
Thanks for an awesome tool!