try quotes

Author: Monarda

.github/workflows/publish-to-test-pypi.yml

@@ -43,7 +43,7 @@ jobs:
         sudo $PIP_PATH install .[test]
     - name: Run tests
       run: |
-        echo "GITHUB_ACTION=true" >> $GITHUB_ENV
+        echo "GITHUB_ACTION=true" >> "$GITHUB_ENV"
         PYTHON_PATH=$(which python)
         sudo $PYTHON_PATH -m coverage run --source=. -m unittest discover tests/
     - name: Gather coverage statistics