Add link to doc builds in GH action

Author: nkammah

.github/actions/docs-preview/action.yml

@@ -30,6 +30,7 @@ runs:
           const comment = `A documentation preview will be available soon.
           Help us out by validating the Buildkite preview and reporting issues [here](https://github.com/elastic/docs/issues/new?labels=buildkite-migration,bug).
 
+            - 🔨 Docs [builds](https://buildkite.com/elastic/docs-build-pr/builds?meta_data[repo_pr]=${REPO}_${PR})
             - 📚 HTML diff: [Buildkite](https://${REPO}_bk_${PR}.docs-preview.app.elstc.co/diff)  - [Jenkins](https://${REPO}_${PR}.docs-preview.app.elstc.co/diff)
             - 📙 Preview: [Buildkite](https://${REPO}_bk_${PR}.docs-preview.app.elstc.co/${PREVIEW_PATH})  -  [Jenkins](https://${REPO}_${PR}.docs-preview.app.elstc.co/${PREVIEW_PATH})
             - 🧪 [Buildkite vs Jenkins diff](https://github.com/elastic/built-docs/compare/${REPO}_bk_${PR}..${REPO}_${PR})`;