The migration adds PR support, models expose PR fields, webhooks handle
PR events, and tests validate it. To be honest the migrations are a bit
redundant at the moment, but I'd like to handle my old deployments so
it's nice(r) to have them. I *am* testing those on baremetal.
Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I02fb4540b62d3e8159ac18b9fa63be916a6a6964
