build: explicitly pass the github token to GH action

Signed-off-by: deadprogram <ron@hybridgroup.com>

.github/workflows/sizediff.yml

@@ -91,5 +91,6 @@ jobs:
       - name: Add comment
         uses: thollander/actions-comment-pull-request@v2.3.1
         with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           filePath: comment.txt
           comment_tag: sizediff