Do not report coverage for initial builds (#1555)

### What kind of change does this PR introduce?

* Prevents coverage from failing in initial Pull Request builds

### Does this PR introduce a breaking change?

No.

.github/workflows/main.yml

@@ -63,7 +63,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - tox-env: "py39-coverage"
+          - tox-env: "py39"  # "py39-coverage"
             python-version: "3.9"
     steps:
       - uses: actions/[email protected]
@@ -79,8 +79,8 @@ jobs:
           python -m tox -e ${{ matrix.tox-env }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          COVERALLS_FLAG_NAME: run-{{ matrix.tox-env }}
-          COVERALLS_SERVICE_NAME: github
+#          COVERALLS_FLAG_NAME: run-{{ matrix.tox-env }}
+#          COVERALLS_SERVICE_NAME: github
 
   test-pypi:
     needs: lint