Replace nginx with PostgreSQL in root compose file

docker-compose.yml

@@ -1,22 +1,30 @@
 services:
-  nginx:
-    image: nginx:alpine
-    container_name: nginx-webserver
-    ports:
-      - "6767:80"
-    volumes:
-      - ./html:/usr/share/nginx/html:ro
+  postgres:
+    image: postgres:16
     restart: unless-stopped
     environment:
-      - NGINX_HOST=localhost
-      - NGINX_PORT=80
-    networks:
-      - nginx-network
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: your_secure_password_here
+      POSTGRES_DB: myapp
+      PGDATA: /var/lib/postgresql/data/pgdata
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
 
-networks:
-  nginx-network:
-    driver: bridge
+  pgadmin:
+    image: dpage/pgadmin4:latest
+    restart: unless-stopped
+    environment:
+      PGADMIN_DEFAULT_EMAIL: admin@example.com
+      PGADMIN_DEFAULT_PASSWORD: admin_password_here
+    volumes:
+      - pgadmin_data:/var/lib/pgadmin
+    ports:
+      - "8080:80"
+    depends_on:
+      - postgres
 
 volumes:
-  nginx-data:
-    driver: local
+  postgres_data:
+  pgadmin_data: