When enabled, the bot responds to all new issues without needing to
be explicitly @mentioned. Useful for deployments where the bot should
proactively handle every incoming issue.
Hardcoded ALLOWED_OWNER="euphon" blocked non-euphon repos from being
processed. Move it to config.yaml as a list so each deployment can
specify its own allowed owners. Also make git user.name/email
configurable for multi-instance deployments (e.g. ms vs yoyo).
