btrfs-progs: ci: upload coverage workflow results to codecov.io

Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

.github/workflows/coverage.yml

@@ -50,3 +50,9 @@ jobs:
         with:
           name: lcov-out
           path: lcov-out
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          files: ${{github.workspace}}/lcov-info
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }