spec-prod now needs permission to write to the gh-pages branch.

Author: jyasskin

.github/workflows/auto-publish.yml

@@ -7,6 +7,8 @@ jobs:
   main:
     name: Build, Validate and Deploy
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - uses: actions/checkout@v5
       - uses: w3c/spec-prod@v2