Fix up autopublish (#212)

Author: yoavweiss

.github/workflows/auto-publish.yml

@@ -2,7 +2,7 @@ name: CI
 on:
   pull_request: {}
   push:
-    branches: [gh-pages]
+    branches: [main]
 jobs:
   main:
     name: Build, Validate and Deploy
@@ -12,6 +12,7 @@ jobs:
       - uses: w3c/spec-prod@v2
         with:
           TOOLCHAIN: bikeshed
+          GH_PAGES_BRANCH: gh-pages
           W3C_ECHIDNA_TOKEN: ${{ secrets.W3C_TR_TOKEN }}
           W3C_WG_DECISION_URL: https://lists.w3.org/Archives/Public/public-web-perf/2021Apr/0005.html
           W3C_BUILD_OVERRIDE: |