build: add github token to comment step

The thank you action can't comment because of missing permissions. Let's
add the github token in the hope this solves it.

Signed-off-by: Daniel Wagner <wagi@kernel.org>

Author: igaw

.github/workflows/thanks.yml

@@ -18,6 +18,7 @@ jobs:
       - name: Comment on merged PR
         uses: actions/github-script@v7
         with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
           script: |
             const prNumber = context.payload.pull_request.number;
             const comment = 'Thanks for your contribution!';