Set magic ENV varialbes for user, default DB

instead of doing it ourselves

docker-compose.yml

@@ -7,6 +7,10 @@ services:
     restart: unless-stopped
     volumes:
       - postgresdata:/var/lib/postgresql/data
+    environment:
+      POSTGRES_DB: invidious
+      POSTGRES_PASSWORD: kemal
+      POSTGRES_USER: kemal
     healthcheck:
       test: ["CMD", "pg_isready", "-U", "postgres"] 
   invidious: