Potential fix for code scanning alert no. 4: Code injection

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: d-oit

.github/workflows/issue-automation.yml

@@ -87,7 +87,6 @@ jobs:
     - name: Handle sub-issue creation requests
       if: contains(github.event.comment.body, '/create-sub-issues')
       run: |
-        comment_body="${{ github.event.comment.body }}"
         issue_number="${{ github.event.issue.number }}"
         
         # Extract sub-issue information from comment
@@ -107,4 +106,5 @@ jobs:
           echo "❌ Invalid sub-issue creation format"
         fi
       env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        comment_body: ${{ github.event.comment.body }}