Fix save_to_file to be indentation independent

app/services/foreman/renderer/scope/macros/base.rb

@@ -124,8 +124,12 @@ def save_to_file(filename, content, verbatim: false)
               content = Base64.encode64(content)
               "cat << #{delimiter} | base64 -d > #{filename}\n#{content}#{delimiter}"
             else
-              content += "\n" unless content.end_with?("\n")
-              "cat << #{delimiter} > #{filename}\n#{content}#{delimiter}"
+              content_echos = content.split("\n").map do |content_line|
+                "echo #{Shellwords.shellescape(content_line)} >> #{filename}"
+              end.join('\n')
+
+              # prefix the append commands with a cleanup command
+              "echo '' > #{filename}\n#{content_echos}"
             end
           end