Attempt to solve problems with cygwin in the CI

Author: abravalheri

.github/workflows/main.yml

@@ -196,8 +196,8 @@ jobs:
       - name: Run tests
         shell: C:\cygwin\bin\env.exe CYGWIN_NOWINPATH=1 CHERE_INVOKING=1 C:\cygwin\bin\bash.exe -leo pipefail -o igncr {0}
         run: |
-          git config --global --add safe.directory "$(cygpath -u "$GITHUB_WORKSPACE")" # workaround for #3408
-          tox
+          git config --global --add safe.directory "$(cygpath -u "${{ github.workspace }}")" # workaround for #3408
+          python -m tox
       - name: Create coverage report
         if: hashFiles('.coverage') != ''  # Rudimentary `file.exists()`
         run: |