mark beta releases as pre-release on github

Author: lovasoa

.github/workflows/release.yml

@@ -63,6 +63,7 @@ jobs:
           name: ${{ github.ref_name }}
           tag_name: ${{ github.ref_name }}
           draft: false
+          prerelease: ${{ contains(github.ref_name, 'beta') }}
           files: |
             sqlpage-windows.zip
             sqlpage-linux.tgz