CI: fix deploy stage

Clean the build tree before running, and list all the stages as the
CI implementation does not merge them from multiple includes

Gbp-Dch: ignore

debian/gitlab-ci.yml

@@ -3,14 +3,21 @@ include:
   - https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/salsa-ci.yml
   - https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/pipeline-jobs.yml
 
+stages:
+  - build
+  - publish
+  - test
+  - deploy
+
 pages:
   image: registry.salsa.debian.org/salsa-ci-team/ci-image-git-buildpackage:latest
-  stage: publish
+  stage: deploy
   artifacts:
     paths:
       - public
   only:
     - master
   script:
+    - git clean -fdx
     - gitlab-ci-git-buildpackage-all
     - gitlab-ci-aptly