chore(backend): Postgres in Docker

Voeg Postgres toe aan simpele docker compose
Initialisatiescript

backend/config/db/init.sql

@@ -0,0 +1,2 @@
+-- Create the database
+CREATE DATABASE dwengo;

docker-compose.yml

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+services:
+  db:
+    image: postgres:latest
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: postgres
+    ports:
+      - "5432:5432"
+    network_mode: "host"
+    volumes:
+        - postgres_data:/var/lib/postgresql/data
+        - ./backend/config/db/init.sql:/docker-entrypoint-initdb.d/init.sql
+
+volumes:
+    postgres_data: