Clean up ..

The debian package builds dumps stuff there and so it might
end up in cached containers.

librem5-pipeline-definitions.yml

@@ -22,6 +22,7 @@ variables:
     - '[ "$L5_ADD_SCRATCH_CI" != "true" ] || wget -O- https://ci.puri.sm/ci-repo.key | apt-key add -'
     - '[ "$L5_ADD_SCRATCH_CI" != "true" ] || apt-get -y update'
     - apt-get -y build-dep .
+    - rm -f ../* || true
   script:
     - '[ "$L5_GIT_SUBMODULE_UPDATE" != "true" ] || git submodule update --recursive'
     - dpkg-buildpackage -b -uc -us