Why can't I access my environment variables at build time when building from a Dockerfile on App Platform?

If you are using a Dockerfile to deploy your app on App Platform, environment variables are only available at build time if you have set them using the --build-arg option in Docker before deploying the app.

For example, to access the variable EXAMPLE=your-value during build time, set it in the image using the docker CLI like this:

docker build --build-arg EXAMPLE=your-value

You cannot use this method to access bindable variables at build time. If you are supplying a Dockerfile, bindable variables are only available at runtime.

Related Topics

How do I generate my app's SSL certificate?

App Platform automatically generates and issues the SSL certificate during the configuration.

Why am I receiving 520 status codes from my app?

Your app may have crashed while trying to receive an upload or return a response larger than it has been configured to manage.

Why am I receiving a forbidden error when making changes to my App Platform app?

Your team balance may be past due. Pay your balance to lift restrictions on actions you can take on the platform.