This container exposes two volumes /config and /data it expects the config file to be /config/config.json.

You will want your config file to contain the line:

dbdir: /data

1. Clone this repo.
2. Write a config.yaml file.
3. Build the container: docker build -t asslack .
4. Assuming you are running this from a directory with a config.yaml file in it you can do the following to generate a registration yaml file: docker run -v /myconfigdir/:/config -t asslack -r -f /config/slack-registration.yaml -u "http://myhomeserver:5858"
5. You can then run the appservice with docker run -p 9898:9898 -p 5858:5858 -v /myconfigdir/:/config -v /mydatadir:/data -t asslack

If you want to change the path of the registration file, you can override the option from the command line, but you will also need to set the port to 5858:

docker run -p 9898:9898 -p 5858:5858 -v /myconfigdir/:/config -v /mydatadir:/data -t asslack -p 5858 -f /config/myregistration.yaml

This requires your appservice port to be 5858.