Fix performance test

Author: FelonEkonom

.circleci/config.yml

@@ -152,6 +152,7 @@ jobs:
     steps:
       - attach_workspace:
           at: .
+      - run: git reset --hard
       - run: cp -r benchmark/ ~/benchmark_backup/
       - run: cp mix.exs ~/benchmark_backup/
       - run: docker pull membraneframeworklabs/docker_membrane