sign the repo, in the OpenSUSE style

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@23798 71c3de6d-444a-0410-be80-ed276b4c234a

opensuse/rsync.sh

 #!/bin/bash -ex
 createrepo .
+GPG_AGENT_INFO= ./repomd-sign $(cat ~/.gpg.passphrase) repodata/repomd.xml
+cp hudson-ci.org.key repodata/repomd.xml.key
 rsync -avz *.key readme.html hudson.repo RPMS repodata hudson-ci.org:~/www/hudson-ci.org/opensuse