jenkins: disable jenkins repo as long as their repo is not signed.
until April 5th, see https://www.jenkins.io/blog/2023/03/27/repository-signing-keys-changing/ Signed-off-by:Holger Levsen <holger@layer-acht.org>
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until April 5th, see https://www.jenkins.io/blog/2023/03/27/repository-signing-keys-changing/ Signed-off-by:Holger Levsen <holger@layer-acht.org>
mentioned in commit 77baefb1