Fix Antora for Milestone & RC

- Verify Antora display_version
- Run workflow for tags
- Allow run workflow manually

Issue gh-10765

.github/workflows/antora-generate.yml

@@ -1,9 +1,11 @@
 name: Generate Antora Files and Request Build
 
 on:
+  workflow_dispatch:
   push:
     branches-ignore:
       - 'gh-pages'
+    tags: '**'
 
 env:
   GH_ACTIONS_REPO_TOKEN: ${{ secrets.GH_ACTIONS_REPO_TOKEN }}