Install docker in the container
Add a named volume called `browsertrix`
Mount the named volume in the worker at /crawls
Expose the host docker socket
Override the environment variable from auto-archiver's Dockerfile so
that it will call docker.
This will require setting new configs in orchestration.yaml:
wacz_archiver_enricher:
browsertrix_home: auto-archiver-api_browsertrix
wacz_collections: /crawls
Set an environment variable in the docker compose file, then reference
that variable in main.py to mount the local archive so that the links
generated by auto-archiver will work correctly. Fixes#8