Update DB env var handling and build process

Author: sebastiankrll

docker/docker-compose.prod.yml

@@ -33,7 +33,7 @@ services:
       dockerfile: packages/db/Dockerfile
     container_name: sr24_prisma
     environment:
-      DATABASE_URL: postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}:${POSTGRES_PORT}/${POSTGRES_DB}?schema=public
+      POSTGRES_URL: postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}:${POSTGRES_PORT}/${POSTGRES_DB}?schema=public
     depends_on:
       timescaledb:
         condition: service_healthy