ENV variables within cloud run server are no accessible - node.js

Question

So,
I am using NUXT
I am deploying to google cloud run
I am using dotenv package with a .env file on development and it works fine.
I use the command process.env.VARIABLE_NAME within my dev server on Nuxt and it works great, I make sure that the .env is in git ignore so that it doesnt get uploaded.
However, I then deploy my application using the google cloud run... I make sure I go to the Enviroments tab and add in exactly the same variables that are within the .env file.
However, the variables are coming back as "UNDEFINED".
I have tried all sorts of ways of fixing this, but the only way I can is to upload my .env with the project - which I do not wish to do as NUXT exposes this file in the client side js.
Anyone come across this issue and know how to sort it out?
DOCKERFILE:
# base node image
FROM node:10
WORKDIR /user/src/app
ENV PORT 8080
ENV HOST 0.0.0.0
COPY package*.json ./
RUN npm install
# Copy local nuxt code to the container
COPY . .
# Build production app
RUN npm run build
# Start the service
CMD npm start
Kind Regards,
Josh

Answer 1

Finally I found a solution.
I was using Nuxt v1.11.x
From version equal to or greater than 1.13, Nuxt comes with Runtime Configurations, and this is what you need.
in your nuxt.config.js:
export default {
publicRuntimeConfig: {
BASE_URL: 'some'
},
privateRuntimeConfig: {
TOKEN: 'some'
}
}
then, you can access like:
this.$config.BASE_URL || context.$config.TOKEN
More details here

Answer 2

To insert value to the environment variables is not required to do it in the Dockerfile. You can do it through the command line at the deployment time.
For example here is the Dockerfile that I used.
FROM node:10
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
CMD ["npm","start"]
this is the app.js file
const express = require('express')
const app = express()
const port = 8080
app.get('/',(req,res) => {
const envtest = process.env.ENV_TEST;
res.json({message: 'Hello world',
envtest});
});
app.listen(port, () => console.log(`Example app listening on port ${port}`))
To deploy use a script like this:
gcloud run deploy [SERVICE] --image gcr.io/[PROJECT-ID]/[IMAGE] --update-env-vars ENV_TEST=TESTVARIABLE
And the output will be like the following:
{"message":"Hello world","envtest":"TESTVARIABLE"}
You can check more detail on the official documentation:
https://cloud.google.com/run/docs/configuring/environment-variables#command-line