Access to DATABASE_URL during build time in the App Platform

I was looking at the environment variables for an App I created in the App Platform with a PostgreSQL database and that the DATABASE_URL is available during build time:

Your component will have access to these variables at both build time and runtime.

However, when trying to access it during the build it wasn’t available. I also downloaded the YAML spec for the app where the scope was set to RUN_TIME

Is there a way to configure DATABASE_URL to be available during build time via the UI?

The only way I can think of doing this is downloading the spec, updating the scope, and then updating the app with the doctl.

Besides that, could the availability of the DATABASE_URL env var be better clarified in the UI to avoid confusion?