ci: fix asset building

Author: mtrezza

.github/workflows/release-manual-assets.yml

@@ -12,6 +12,8 @@ jobs:
   assets:
     if: github.event.inputs.tag != ''
     runs-on: macos-11
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2