PIPELINE: fix generation of versions.json

.gitlab-ci.yml

@@ -42,7 +42,7 @@ add-commit:
     - echo ",{\"server\"${COLON} \"$SERVER\", \"mysqlbackend\"${COLON} \"$MYSQL\", \"pylib\"${COLON} \"$PYLIB\", \"webui\"${COLON} \"$WEBUI\" }" >> versions.json
 
       # add closing ] again
-    - echo "\n]" >> versions.json
+    - echo -n "]" >> versions.json
     - cat versions.json | jq
 
       # create the commit.json which is to send to the commit api of gitlab