autobuilder fixes from drush:

 * upload to unstable
 * fix commitlog to indicate the jenkins build tag
 * make PGP key customizable

debian/rules

@@ -11,6 +11,9 @@ override_dh_install:
 	cp -r "$(CURDIR)/db/"  "$(CURDIR)/dns/"  "$(CURDIR)/http/" "$(CURDIR)/aegir.make" "$(CURDIR)/platform/" "$(CURDIR)"/*.inc "$(CURDIR)"/*.php "$(CURDIR)"/*.info "$(CURDIR)/debian/aegir-provision/usr/share/drush/commands/provision/"
 	cp "$(CURDIR)/debian/aegir-provision.lintian" "$(CURDIR)/debian/aegir-provision/usr/share/lintian/overrides/aegir-provision"
 
+DOMAIN?=$(shell hostname -f)
+KEY?="-kjenkins@$(DOMAIN)"
+
 # this builds a debian package based on what the current branches are
 # this usually tests the latest release
 jenkins-build-official:
@@ -29,9 +32,9 @@ debian_version=$(shell git describe --tags origin/debian | sed "s/debian\///;s/-
 # this assumes you are on a "debian" branch (of course)
 jenkins-build-auto:
 	git merge origin/6.x-1.x
-	dch -v ${upstream_version}-${debian_version} "automatic jenkins build ${BUILD_TAG}"
-	git commit -m"dummy commit for $version autobuild" debian/changelog
-	git-buildpackage -b --git-upstream-branch=origin/6.x-1.x -kjenkins@ci.aegirproject.org
+	dch -D unstable -v ${upstream_version}-${debian_version} "automatic jenkins build ${BUILD_TAG}"
+	git commit -m"dummy commit for jenkins ${BUILD_TAG} autobuild" debian/changelog
+	git-buildpackage -b --git-upstream-branch=origin/6.x-1.x ${KEY}
 
 show-version:
 	@echo ${upstream_version}-${debian_version}