CI: enable snapshot repo for snapshot releases

Author: RingerJK

.circleci/config.yml

@@ -779,6 +779,10 @@ jobs:
     steps:
       - check-snapshot-label
       - checkout
+      - run:
+          name: Allow snapshot repository for snapshot releases
+          environment:
+            ALLOW_SNAPSHOT_REPOSITORY: true
       - assemble-core-release
       - assemble-ui-release
       - prepare-mbx-ci