fix: only run pre-commit on branches that are not main (#50)

.github/workflows/test.yml

@@ -49,6 +49,7 @@ jobs:
         run: poetry run tox
 
       - name: Lint
+        if: github.ref != 'refs/heads/main'
         run: |
           source $(poetry env info --path)/bin/activate
           pre-commit install --install-hooks