[New] devel/snare

This is a new port for snare, a GitHub webhooks runner daemon. From
pkg/DESCR:

snare is a GitHub webhooks runner daemon. When snare receives a webhook
event from a given repository, it authenticates the request, and then
executes a user-defined "per-repo program" with information about the
webhook event.

More info at https://tratt.net/laurie/src/snare/

This version of the port is for snare 0.2.0; edd@ OK'd the 0.1.0 version of
this port.


Laurie
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