Cant use env vars in compose apparently

Author: pamelafox

.devcontainer/docker-compose.yml

@@ -27,9 +27,9 @@ services:
     volumes:
       - postgres-data:/var/lib/postgresql/data
     environment:
-      POSTGRES_USER: "${DBUSER}"
-      POSTGRES_DB: "${DBNAME}"
-      POSTGRES_PASSWORD: "${DBPASS}"
+      POSTGRES_DB: app
+      POSTGRES_USER: app_user
+      POSTGRES_PASSWORD: app_password
 
     # Add "forwardPorts": ["5432"] to **devcontainer.json** to forward PostgreSQL locally.
     # (Adding the "ports" property to this file will not forward from a Codespace.)