Logic for prereleases in github actions

.github/workflows/build.yml

@@ -55,6 +55,7 @@ jobs:
       uses: softprops/action-gh-release@v1
       if: startsWith(github.ref, 'refs/tags/')
       with:
+        prerelease: ${{ !startsWith(github.ref, 'refs/tags/v') || contains(github.ref, '-pre') }}
         files: ${{ github.event.repository.name }}-${{ steps.osname.outputs.lowercase }}.zip
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}