fix: add missing environment variable for GH_TOKEN in PR commits and author check steps

Author: niros1

.github/workflows/reassign-copilot-commits.yml

@@ -40,13 +40,17 @@ jobs:
 
       - name: Get PR commits
         id: commits
+        env:
+          GH_TOKEN: ${{ secrets.GH_PAT }}
         run: |
           COMMITS=$(gh pr view $PR_NUMBER --json commits -q '.commits[].oid')
           echo "COMMITS=$COMMITS" >> $GITHUB_ENV
           echo "$COMMITS" > commits.txt
 
       - name: Check for Copilot as author
         id: check_copilot
+        env:
+          GH_TOKEN: ${{ secrets.GH_PAT }}
         run: |
           COPILOT_EMAILS="github-actions[bot]@users.noreply.github.com\[email protected]\[email protected]"
           FOUND=0