github-action: Add AsciiDoc freeze warning (elastic#15426) (elastic#15772)

Co-authored-by: Victor Martinez <[email protected]>
Co-authored-by: Brandon Morelli <[email protected]>
(cherry picked from commit fef391a)

Co-authored-by: Jan Calanog <[email protected]>

Author: mergify[bot]

.github/workflows/comment-on-asciidoc-changes.yml

@@ -0,0 +1,19 @@
+---
+name: Comment on PR for .asciidoc changes
+
+on:
+  # We need to use pull_request_target to be able to comment on PRs from forks
+  pull_request_target:
+    types:
+      - synchronize
+      - opened
+      - reopened
+    branches:
+      - main
+
+jobs:
+  comment-on-asciidoc-change:
+    permissions:
+      contents: read
+      pull-requests: write
+    uses: elastic/docs-builder/.github/workflows/comment-on-asciidoc-changes.yml@main