You only need to include the variables you need during the build, so please remove all the ENV lines.

please could you modify this dockerfile to work, i have tried several ways, i did it like you suggested, did it without the env lines and still not working, and i did it before and after the npm build command, before and after the cmd, i dont understand why still not working

What variables does the build need?

it would be these ones:

ARG RAILWAY_PUBLIC_DOMAIN
ARG RAILWAY_PRIVATE_DOMAIN
ARG RAILWAY_PROJECT_NAME
ARG RAILWAY_ENVIRONMENT_NAME
ARG RAILWAY_SERVICE_NAME
ARG RAILWAY_PROJECT_ID
ARG RAILWAY_ENVIRONMENT_ID
ARG RAILWAY_SERVICE_ID
# app env variables
ARG DATABASE_URL
ARG JWT_SECRET
ARG JWT_EXPIRES_IN

these are the env variables defined in the settings of the project

Why do you have the Railway variables defined? does your build need then

mmm, i thought i have to use all the variables that are in railway, i think railway is the best platform for deploy, i really wanto to use it, for now im using back4app, but i want to keep using railway but i cannot because of this problem

Can you please provide a minimal reproducible example?

Have you saved the changes you have made in the service variables?

the railway app is not working, but what i did is

• i created the project for the nestjs app

• i went to variables and the default railway env variables were there and i just added the ones from my env file i use locally JWT_SECRET JWT_EXPIRES_IN DATABASE_URL

• i modified the dockerfile to use ARG as is explained here: https://docs.railway.app/guides/dockerfiles#using-variables-at-build-time

• i saved the changes and let the automatic deploy

the app is build correctly, the nestjs app works, but when trying to get the env variables i receive the error regarding the jwt secret not defined, and invalid database url, that means the env variables are not being detected

I am unable to reproduce, the variables are loaded into the environment just fine. Are you committing your .env file to GitHub?

do i have to commit my env file? but they are supposed to be secret, and it should be replaced by railway

if you can check it with this monorepo:
https://github.com/macluiggy/social-media

this is the one i cant deploy the backend

Please show me a screenshot of your service variables.

i found the issue, it was because the env variables in railway would not be saved until i press the apply changes button

i wondered why the env variables were purple, i thought it was because there were not the default ones, but the purple color mean that those are changes not saved yet

I'm also not sure why you have used shared variables? using those incorrect can also cause issues.

Do you think you can share some insights into how you overlooked the big Deploy button?

I'm also not sure why you have used shared variables? using those incorrect can also cause issues.

Do you think you can share some insights into how you overlooked the big Deploy button?

I had the exact same issue, the UX is really not clear, they change colour but the deploy button is on a completely different screen and it's not apparent that it's linked to the variables. When you save the variables you think it's saved so I think if the button was actually on the same page it'd be much more apparent.

Thank you for sharing your feedback, much appreciated!