chore: Move and update the Dockerfile for the database configuration

docker-compose.yml

@@ -1,8 +1,8 @@
 services:
   frontend:
     build:
-      context: .
-      dockerfile: ./Dockerfile
+      context: ./
+      dockerfile: ./docker/app.Dockerfile
     environment:
       - PORT=${WEB_PORT}
     ports:
@@ -14,9 +14,13 @@ services:
       - ./tsconfig.json:/app/tsconfig.json
       - ./svelte.config.js:/app/svelte.config.js
   db:
-    image: postgres:16
+    build: 
+      context: ./
+      dockerfile: ./docker/postgres.Dockerfile
     environment:
       - POSTGRES_PASSWORD=${PG_PASS}
+      - POSTGRES_USER=${PG_USER}
+      - POSTGRES_DB=${PG_DB}
     ports:
       - ${PG_PORT}:5432
     volumes:

docker/postgres.Dockerfile

@@ -0,0 +1,3 @@
+FROM postgres:16
+
+COPY ./docker/initdb.d/ /docker-entrypoint-initdb.d/