ci: Print all the commits that need bug references

Rather than just the latest one, otherwise it might leave the patch
submitter to iterate over every commit, if they didn't know every patch
needed a reference.

Closes: #1809

.gitlab-ci/check-commit-log.sh

@@ -40,6 +40,7 @@ function commit_message_subject_is_compliant() {
   return 0
 }
 
+RET=0
 for commit in $commits; do
   commit_short=$(echo $commit | cut -c -8)
 
@@ -52,6 +53,8 @@ for commit in $commits; do
   if [ $? != 0 ]; then
     echo "Commit message for $commit_short is not compliant:"
     echo "$errors"
-    exit 1
+    RET=1
   fi
 done
+
+exit $RET