Enable .htaccess generation on per branch builds

See gh-32044

Author: sdeleuze

Diff for: lib/antora/templates/per-branch-antora-playbook.yml

@@ -32,6 +32,7 @@ asciidoc:
   sourcemap: true
 urls:
   latest_version_segment: ''
+  redirect_facility: httpd
 runtime:
   log:
     failure_level: warn