Update GitHub Release workflow configuration

Upgrade action-gh-release to v2, add draft and prerelease flags, and simplify token configuration

.github/workflows/build.yml

@@ -57,12 +57,11 @@ jobs:
           path: build/*.deb
 
       - name: Upload to GitHub Release
-        if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@v2
         with:
-          files: build/*.deb
+          token: ${{ secrets.GITHUB_TOKEN }}
           tag_name: v1.0.0
           name: Release v1.0.0
-          generate_release_notes: true
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 
+          files: build/*.deb
+          draft: true
+          prerelease: true