Simplify workflow

.gitea/workflows/test.yaml

@@ -3,9 +3,6 @@ on: [push]
 jobs:
   test-on-protected-branch:
     runs-on: ubuntu-latest
-    permissions:
-      # Give the default GITHUB_TOKEN write permission to commit and push the changed files back to the repository.
-      contents: write
     steps:
       - name: Fix dns
         run: echo 'nameserver 1.1.1.1' > /etc/resolv.conf
@@ -15,15 +12,11 @@ jobs:
       - name: Add a line to README.md
         run: |
           echo -e "$(date) - commited via Gitea Actions\n" >> README.md
-      - name: Get last commit message
-        id: last-commit
-        run: |
-          echo "author=$(git log -1 --pretty=\"%an <%ae>\")" >> $GITHUB_OUTPUT
       - name: Commit changes back
         uses: https://github.com/stefanzweifel/git-auto-commit-action@v5
         with:
-          commit_user_name: eliroca
-          commit_author: ${{ steps.last-commit.outputs.author }}
+          commit_user_name: gitea-actions-bot
+          commit_author: Gitea Actions bot <bot+gitea@example.com>
           commit_message: "[skip actions] Gitea Actions run"
           commit_options: '--no-edit'
           skip_fetch: true