I've created a pod that works as Nginx Proxy. It works well with the default configuration but when I add my custom configuration via ConfigMap it crashes. This is the only log I have.

/bin/bash: /etc/nginx/nginx.conf: Read-only file system

My deployment.yaml

volumeMounts:
      - name: nginx-config
        mountPath: /etc/nginx/nginx.conf
        subPath: nginx.conf
        readOnly: false
  volumes:
  - name: nginx-config
    configMap:
      name: nginx-config

If could help I've found this answer on StackOverflow but I don't understand how to do those passages.