I try to pass one full stack application hosted in Heroku to another hosted in a kubernetes cloud (Digital Ocean exactly): I am stuck with the keys. In the original full stack application I have a file where I put the keys for development env:

module.exports={
  googleClientID: 'Client ID',
  googleClientSecret: 'secret sequence',
  mongoURI: 'mongodb+srv://data_to_connect',
  cookieKey: 'some_code',
  fbClientID: 'Client ID',
  fbClientSecret: 'secret sequence',
  stripePublishableKey: 'public key',
  stripeSecretKey: 'secret sequence'
}

And after another file with the keys for production. In this case the secrets were put in the Heroku environment; so, this file, made public, didn´t show the secret keys.

module.exports={
  googleClientID: 'Client ID',
  googleClientSecret: GOOGLE_CLIENT_SECRET, // Place in Heroku host
  ...
}

Now, I try to convert this application in a kubernetes application. In the kubernetes config. file for the server, I placed the above keys as environment variables:

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: server-depl
    ...
    template:
        metadata:
          labels:
            app: server
        spec:
          containers:
            - name: server
              image: myimage
              env:
                - name: googleClientID
                  value: 'Client ID' // Same that above
                - name: googleClientSecret  // Secret made with kubernetes secret generic command
                  valueFrom:
                    secretKeyRef:
                      name: google-secret
                      key: googleClientSecret
              ....

And after referencing those env. variables in the proper file with process.env.KEY, that would work in the dev. environment (with skaffold) as in production environment (digital ocean).

clientID: process.env.googleClientID,
clientSecret: process.env.googleClientSecret,

That is not working. Some hint how to do that transfer?