I used the Strapi 5 template (https://github.com/szilardkoppel/railway.app-strapi) to deploy a Strapi application. It worked well and I was able to access the application online.
But I need to develop it locally.
So I cloned the template in one of my existing Github repos, where the frontend of my application is located.
My mono-repo looks like this

• a frontend folder

• a backend folder, which contains your Strapi 5 template.
  I've specified to Railway the backend folder that contains the Strapi code.
  Now I can start the appplication locally but the deployment no longer works.
  The logs show that the build is OK, but on deployment I get an error:
  ‘Cannot find module ‘pg’’

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