wrap it in an env var and add it to the env file

Jenkinsfile

@@ -5,9 +5,9 @@ pipeline {
     stage('Init') {
       steps {
         sh 'rbenv local 3.2.2'
-        sh 'ruby secret.rb'
+        sh 'echo \\\'ENV[\\\"APP_SESSION_SECRET\\\"] ||= $(ruby secret.rb)\\\' > .env.rb'
         //sh 'echo "ENV[\\\"DB_NAME\\\"] ||= \\\"url_shortener.db\\\"" >> .env.rb'
-        //sh 'cat .env.rb'
+        sh 'cat .env.rb'
       }
     }
   }