ci(workflows): replace GITHUB_TOKEN with PUSH_TOKEN for Docker authentication

Author: kimonmeier

.github/workflows/publish-release.yml

@@ -66,7 +66,7 @@ jobs:
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.PUSH_TOKEN }}
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v5