Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Based on https://github.com/matrix-org/rageshake

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

This makes it consistent with the rest of the playbook:
- there's a default config which has various variables controlling
  settings
- there's also an `_extension_yaml` variable, which lets you override it