Add skip-existing option to publish

.github/workflows/build.yml

@@ -36,6 +36,6 @@ jobs:
           poetry config virtualenvs.create false
           poetry build
           # basemath is already present as a package (as in math with bases), so use a slightly different name
-          poetry publish -u "__token__" --password "$PYPI_TOKEN"
+          poetry publish --skip-existing -u "__token__" --password "$PYPI_TOKEN"
         env:
           PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}