Skip coverage on forks

Author: jacebrowning

.github/workflows/main.yml

@@ -41,6 +41,7 @@ jobs:
 
     - name: Upload coverage
       uses: codecov/codecov-action@v4
+      if: ${{ github.repository == 'jacebrowning/gitman' }}
       with:
         fail_ci_if_error: true
         token: ${{ secrets.CODECOV_TOKEN }}