Consider switching to the docker-container driver

Consider switching back to using the docker-container Docker driver, which will require changes in `python/aswfdocker/builder.py`:

```
111 - "output": ["type=registry,push=true" if self.push else "type=docker"],
111 + "output": [ "type=registry,push=true" if self.push else "type=image,push=false" ],
```

reverting the changes in `docker-builds.yml` and `release.yml` as well as documenting the necessary local configuration.

Start with python/aswfdocker/builder.py around the output configuration, then compare the related settings in docker-builds.yml and release.yml. Check the current Docker driver behavior and identify the local configuration guidance that must be documented. Done means the driver, CI, release behavior, and local setup are consistent and documented.

Written by the indexing model from the issue text.