chore: buildpackage has been moved to infra/dockerfiles

integrate when https://forge.extranet.logilab.fr/logilab/infra/dockerfiles/-/merge_requests/24
has been published

templates/build-debian-package.yml

@@ -5,7 +5,7 @@
 
 build-debian:
   stage: build-debian-package
-  image: logilab/cubicweb:buster-buildpackage
+  image: logilab/infra/dockerfiles/buildpackage
   rules:
     - if: '$CI_MERGE_REQUEST_ID'
       when: never