Merge pull request #3321 from alphagov/reduce-repo-size

Remove old GitHub Pages commits to reduce repo size

Author: ollietreend

.github/workflows/ci.yml

@@ -62,3 +62,4 @@ jobs:
           publish_dir: ./build
           cname: docs.publishing.service.gov.uk
           commit_message: ${{steps.commit_message_writer.outputs.commit_message}}
+          force_orphan: true