fix: add env paths and correct postgress image

Author: icep0ps

Dockerfile

@@ -1,16 +1,20 @@
 version: '3.8'
 services:
   db:
-    container_name: postgres
-    image: postgis/postgis:15-3.3
+    container_name: code-racer-postgres
+    image: postgres:15-bullseye
     restart: always
     environment:
-      - POSTGRES_USER=postgres
-      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+      - POSTGRES_USER=${DATABASE_USERNAME}
+      - POSTGRES_PASSWORD=${DATABASE_PASSWORD}
+      - POSTGRES_DB=${DATABASE_NAME}
+    env_file:
+      - .env
     ports:
-      - '5432:5432'
+      - ${DATABASE_PORT}:${DATABASE_PORT}
     volumes:
       - db:/var/lib/postgresql/data
+      - ./sql/init.sql:/docker-entrypoint-initdb.d/init.sql
 volumes:
   db:
     driver: local