forge: enable adoc render for staging

Signed-off-by: Ryan Lerch <rlerch@redhat.com>

roles/openshift-apps/forgejo/templates/values.yaml.j2

@@ -626,6 +626,16 @@ gitea:
     ## @param gitea.config.markup Configuration for advanced markup processors
     markup: {}
 
+{% if env == "staging" %}
+    markup.asciidoc:
+      ENABLED:true
+      NEED_POSTPROCESS = true
+      FILE_EXTENSIONS = .adoc,.asciidoc
+      RENDER_COMMAND = "asciidoctor --embedded --safe-mode=secure --out-file=- -"
+      IS_INPUT_FILE = false
+      RENDER_CONTENT_MODE: sanitized
+{% endif %}
+
     ## @param gitea.config.highlight.mapping File extension to language mapping overrides for syntax highlighting
     highlight.mapping: {}