Set GITHUB_TOKEN for Diffend URL comment step

Follow-up to 11f78ef

Author: dentarg

action.yml

@@ -47,6 +47,8 @@ runs:
 
     - name: Post Diffend URL
       shell: bash
+      env:
+        GITHUB_TOKEN: ${{ inputs.github-token }}
       run: |
         echo "https://my.diffend.io/gems/$COMPARE_GEM/$COMPARE_FROM_VERSION/$COMPARE_TO_VERSION" >> comment0.txt
         with_retries gh pr comment $PR_NUMBER --body-file comment0.txt --repo ${{ github.repository }}