separate release upload

Author: stewartboogert

.github/workflows/main.yaml

@@ -59,5 +59,14 @@ jobs:
           draft: false
           prerelease: false
           allowUpdates: true
-          artifacts: ./geant4-${{ matrix.os }}-${{ matrix.geant4-version }}.tgz
 
+      - name: Upload Release Asset
+        id: upload-release-asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./geant4-${{ matrix.geant4-version }}.tgz
+          asset_name: geant4-${{ matrix.os }}-${{ matrix.geant4-version }}.tgz
+          asset_content_type: application/gzip