Make the CENTR stats schema check optional via CI env variable...

Make the CENTR stats schema check optional via CI env variable 'CHECK_CENTR_SCHEMA' (set to '0' to disable the check)

.gitlab-ci.yml

@@ -34,9 +34,8 @@ build:
   script:
     - source pwait.sh
     - mkdir public
-    - curl 'https://stats.centr.org/schemas/registration_data_v2.1.json' > 'registration_data_v2.1.json';
     - python Dashboard/Python/centr_stats.py | jq . > public/centr_stats.json
-    - check-jsonschema --schemafile registration_data_v2.1.json public/centr_stats.json
+    - [ $CHECK_CENTR_SCHEMA != "0" ] && curl 'https://stats.centr.org/schemas/registration_data_v2.1.json' > 'registration_data_v2.1.json' && check-jsonschema --schemafile registration_data_v2.1.json public/centr_stats.json;
     - shopt -s globstar nullglob nocaseglob nocasematch
     - python3 Dashboard/Python/pages.py Dashboard/pages.json
     - python3 Dashboard/Python/docs.py > Dashboard/docs.json