ci: expand dch comment to appease lintian

so that any lintian items are actionable

.gitlab/ci/debian.yml

@@ -39,7 +39,7 @@ include:
     - export DEBFULLNAME="GitLab"
     - export DEBEMAIL="gitlab@git.ligo.org"
     - tar -zxf ${TARBALL}
-    - (cd gwdatafind-server-*/ && dch --rebuild 'ci')
+    - (cd gwdatafind-server-*/ && dch --rebuild 'Rebuild for CI')
     - tar -zcf ${TARBALL} gwdatafind-server-*/
 
 dsc:bullseye: