feat: add database with dummy data

app/docker-compose.yml

@@ -4,7 +4,41 @@ services:
     restart: unless-stopped
     networks:
       - lora-gateway_mqtt
+      - database
+
+  db:
+    image: postgres:18-alpine
+    restart: unless-stopped
+    volumes:
+      - ./consumer/initdb:/docker-entrypoint-initdb.d:ro
+      - db:/var/lib/postgresql
+    networks:
+      - database
+    environment:
+      - POSTGRES_USER=simugaz
+      - POSTGRES_PASSWORD=simugaz
+      - POSTGRES_DB=simugaz
+  
+  pgadmin:
+    image: dpage/pgadmin4:latest
+    restart: unless-stopped
+    ports:
+      - 8081:80
+    networks:
+      - public
+      - database
+    volumes:
+      - ./servers.json:/pgadmin4/servers.json
+    environment:
+      PGADMIN_DEFAULT_EMAIL: admin@example.com
+      PGADMIN_DEFAULT_PASSWORD: changeme
+    
+volumes:
+  db:
 
 networks:
+  public:
+  database:
+    internal: true
   lora-gateway_mqtt:
     external: true