Allow to run multiple workloads on the same webhook

Basically we might want to do multiple processing on the same webhook:

• add a tag to an issue
• check for spam on the issue
• answer the reporter with a greeting
• etc...

Currently we have 2 issues that are interfering here. Solving one or the other would resolve the bug but technically we need to solve both IMO:

• we can register a webhook to a project once (.wrap_fn in fn config in src/server.rs) -> we should probably match for the token here
• the set of rules we apply is a Or -> we should probably keep all the rules, and run all the payloads if there is a match