The existing snapcraft file lacks any way to specify the configuration of the webhook
service, which means there seems to be no way of telling it where it should look for hooks or how to set other runtime parameters.
I'm no snap expert but it seems that as a consequence of this, the existing snap is pretty much useless.
Looking at the snapcraft docs, it seems this would be fixable by adding some additional logic in order to deal with configuration, as mentioned in:
https://snapcraft.io/docs/adding-snap-configuration
This seems like a substantial effort though.
I guess I could try to contribute a PR with this, without much of a promise for a timeline (would be a good opportunity to learn about snaps) - but in the meanwhile, perhaps the existence of the snap installation option should be removed from the webhook README?