Makefile: Add missing generate dependency
Makefile: Add missing generate dependency

In 1cc52431074c226af561a68ba1df2e4071e466c1 the dependency was not
added to the ci-release-test target (which also requires it!)

Signed-off-by: Torin Sandall <933af5bec0bc58056526d55ca6c7b45fcf14cc48@gmail.com>

open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,tsandall/opa,tsandall/opa