Implement hook for mentions in comments

[0xdeadbeefJERKY]

Implement webhook that parses the content of a comment (e.g., within Issues, PRs) and identifies Gitea username mentions (e.g., via regex). Additionally, create a mapping between Gitea accounts and their corresponding Keybase accounts, allowing the webhook to specifically ping the user within Keybase that owns the Gitea account being mentioned in the comment.

[vladionescu]

Assuming the Gitea comment contains an @username string, Keybase should automatically make that clickable and a mention as if you typed it yourself in chat.

The problem will be when someone has a different Gitea username from their Keybase username. For instance I'm @vladi on Keybase but @vlad on the local Gitea server.

Since this bot already uses a DB for storing other stuff, we can store a mapping of Gitea<->Keybase usernames and, when the bot sees a Gitea user mentioned it can @ them using their Keybase username.

I'm thinking we can let people opt-in to getting mentioned in chat whenever a certain word appears in a Gitea payload (comment, commit message, etc).

!gitea notifyme <word>

People can use this to ask the bot to mention them whenever a certain word appears. Initially it can be used for the username mapping, but it's just as usable for watching for activity concerning a certain thing, like "infrastructure" or "javascript".

[NiorVector]

Problem solved, the gitea user profile requires a "fullname" in order to be displayed. I recommend all of us using our keybase usernames with the @ symbol. Example: fullname: @malwareunicorn