spam management for forgejo

Usage

• create an API token for your admin account, and write it in an api_token file at the root of the repo
• remove model.json if you want to start with no pre-existing model of what is spam or not. Or keep it to use the current classifier. The file gets updated when using the tool: the classifier learns from spam/legit decisions and should get progressively better at identifying spam.
• run: cargo run
• classify users as spam/not spam. Right now the classification is stored locally in db.json, no concrete action is taken. (Ultimately we will want to lock/delete accounts, etc.)

Todos

• gate the actual account lock/email/deletion behind an environment variable for easy testing and to limit bad surprises
• discuss the current design choices for when locking the account/sending a notification email fails. (Current behavior is to periodically retry, avoid deleting if the account could not be locked, but delete the account after the grace period even if the email could not be sent…)
• add backend to store data on garage instead of local files
• replate the api_token file with a better mechanism: oauth maybe?
• improve error handling