ci: use default GITHUB_TOKEN instead of app token

Author: Hweinstock

.github/workflows/preview-tarball.yml

@@ -29,15 +29,9 @@ jobs:
         run: |
           TARBALL_NAME=$(ls *.tgz | head -1 | xargs basename)
           echo "name=$TARBALL_NAME" >> $GITHUB_OUTPUT
-      - name: Generate GitHub App Token
-        id: app-token
-        uses: actions/create-github-app-token@v1
-        with:
-          app-id: ${{ vars.APP_ID }}
-          private-key: ${{ secrets.APP_PRIVATE_KEY }}
       - name: Create or update prerelease
         env:
-          GH_TOKEN: ${{ steps.app-token.outputs.token }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           TARBALL_NAME: ${{ steps.tarball.outputs.name }}
         run: |
           TAG="prerelease"