tox happy
And manual check:
```
$ cd $SWH_ENVIRONMENT_HOME/swh-loader-git
$ pip install -e .
$ swh loader run --help
WARNING:swh.core.cli:Could not load subcommand graph: module 'swh.graph.cli' has no attribute 'cli'
WARNING:swh.core.cli:Could not load subcommand dataset: module 'swh.dataset.cli' has no attribute 'cli'
Usage: swh loader run [OPTIONS] [archive|cran|debian|deposit|git|git_disk|merc
urial|nixguix|npm|pypi|svn] URL [OPTIONS]...
Ingest with loader <type> the origin located at <url>
Options:
-h, --help Show this message and exit.
```
`swh loader run git_disk` is there alright.