ci(test): Run pytest through poetry

Might resolve the previous unresolved ci issue in #59

.github/workflows/test-worker.yml

@@ -51,14 +51,11 @@ jobs:
           set -xe
           python -m pip install poetry coverage pytest
           python -m poetry install
-          python -m poetry self add poetry-plugin-export
-          python -m poetry export -f requirements.txt --output requirements.txt
-          python -m pip install -r requirements.txt
 
       - name: Test with pytest
         run: |
           set -xe
-          python -m pytest -sv
+          python -m poetry run pytest -sv
 
   check:
     if: always()