docs/release: do a detached sig
docs/release: do a detached sig

giantswarm/fleet,dongsupark/fleet,coreos/fleet,jonboulle/fleet,dongsupark/fleet,dongsupark/fleet,giantswarm/fleet,jonboulle/fleet,coreos/fleet,endocode/fleet,jonboulle/fleet,endocode/fleet,giantswarm/fleet,coreos/fleet,endocode/fleet