tox + run on docker:
docker-compose.override.yml:
```
version: '2'
services:
swh-loader:
volumes:
# - "$SWH_ENVIRONMENT_HOME/swh-loader-core:/src/swh-loader-core"
- "$SWH_ENVIRONMENT_HOME/swh-loader-mercurial:/src/swh-loader-mercurial"
```
```
$ doco up
$ doco exec swh-loader run mercurial https://www.mercurial-scm.org/repo/evolve/
```