controller/worker: Skip sirenia deployment if scaled to 0
controller/worker: Skip sirenia deployment if scaled to 0

Signed-off-by: Joseph Glanville <aed65cdb66c1129f81e57d35b788d35820e08ea4@jpg.id.au>

flynn/flynn,lmars/flynn,flynn/flynn,flynn/flynn,lmars/flynn,lmars/flynn,philiplb/flynn,lmars/flynn,philiplb/flynn,lmars/flynn,philiplb/flynn,flynn/flynn,philiplb/flynn,flynn/flynn,philiplb/flynn