include generated_signing_key package in tsa
include generated_signing_key package in tsa

so that it can be installed independently from atc

Signed-off-by: Chris Dutra <7eb54fc324f04033595eb420f2ee7c112fb7259e@pivotal.io>

cjcjameson/concourse,cjcjameson/concourse,cjcjameson/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse