Fixed CI job

.gitlab-ci.yml

@@ -3,11 +3,11 @@ pages:
   stage: build
   image: python:3
   before_script:
-    - mkdir artifacts
+    - mkdir public
   artifacts:
     name: "instances"
     paths:
-      - artifacts
-  script: python collect.py instances.txt artifacts/
+      - public
+  script: python collect.py instances.txt public/
   only:
     - master@funkwhale/instances