tests: add a helper script to poke our webhook implementation
To test our server we can run ./tests/poke-webhook.sh push-event
which
calls the webhook with (hopefully) valid data. It uses the server config
and the first project defined in the Settings.yaml file.
The json is copied from the gitlab documentation here: https://docs.gitlab.com/ee/user/project/integrations/webhook_events.html
Kinda needs !2 (closed) first so we can actually run the server ;)