deckard: add OPTS variable to Makefile

Can be used for passing option to Deckard (eg. --noclean).
8 jobs for keeplog in 2 minutes and 42 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #58189
docker linux amd64
test:comparative:kresd

00:00:31

passed #54484
docker linux amd64
test:latest:kresd

00:01:45

passed #54480
docker linux amd64
test:pep8

00:00:22

passed #54481
docker linux amd64
test:pylint

00:00:57

passed #54486
docker linux amd64
test:sanity:pdnsrecursor

00:00:57

passed #54485
docker linux amd64
test:sanity:unbound

00:00:51

passed #54482
docker linux amd64
test:unittests

00:00:29

failed #54483
docker linux amd64
test:comparative:kresd

00:00:48