Allow test-scheme to fail

.gitlab-ci.yml

@@ -153,6 +153,7 @@ test-scheme:
       - CHECKS: response_schema_conformance
   script:
     - schemathesis run -c "$CHECKS" -b http://tank:"$TANK_PORT" --hypothesis-suppress-health-check too_slow api/docs/openapi/openapi.yaml
+  allow_failure: true
 
 docker-hub-push:
   # Use the official docker image.