Keep files in asciidoc-publish.yml

This is so that the existing published Javadocs there will stay there in case the Javadoc publishing step fails to upload new Javadocs.

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Leandru Martin <122942864+leandrumartin@users.noreply.github.com>

Author: leandrumartin

.github/workflows/asciidoc-publish.yml

@@ -24,3 +24,4 @@ jobs:
         deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
         publish_branch: gh-pages
         publish_dir: ./pi4micronaut-utils/build/docs/asciidoc/
+        keep_files: true