fix: save manifest before branch switch to avoid overwrite on push

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/publish.yml

@@ -144,9 +144,14 @@ jobs:
         run: |
           git config user.name "gitea-actions"
           git config user.email "actions@noreply.local"
+          cp manifest.json /tmp/manifest_updated.json
+          git fetch origin main
+          git checkout main
+          git pull --rebase origin main
+          cp /tmp/manifest_updated.json manifest.json
           git add manifest.json
           git diff --staged --quiet || git commit -m "chore: update manifest for ${{ github.ref_name }}"
-          git push origin HEAD:${{ github.event.repository.default_branch }}
+          git push origin main
 
       - name: Create release and upload assets
         run: |