Provide GitHub token to jules-merge action

Added `GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}` to the environment variables for the jules-merge scan step to resolve the "GitHub auth not configured" failure.

Author: LeanBitLab

.github/workflows/jules-merge-conflicts.yml

@@ -19,5 +19,7 @@ jobs:
           fetch-depth: 0
 
       - name: Scan for overlapping changes
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           npx -y --package=@google/jules-sdk --package=@modelcontextprotocol/sdk --package=@google/jules-merge jules-merge scan --json '{"prs":[${{ github.event.pull_request.number }}],"repo":"${{ github.repository }}","base":"${{ github.event.pull_request.base.ref }}"}'