Add Docker support with Dockerfile and docker-compose.yml

- Introduced a Dockerfile for building the application using a multi-stage build process.
- Added docker-compose.yml to define services for the application and PostgreSQL database.
- Updated README.md with instructions for running the application using Docker and Docker Compose.

docker-compose.yml

@@ -0,0 +1,31 @@
+version: '3.8'
+
+services:
+  app:
+    build: .
+    ports:
+      - "3000:3000"
+    depends_on:
+      - db
+    environment:
+      - DATABASE_URL=postgres://postgres:postgres@db/hospitaldb
+      - HOST=0.0.0.0
+      - PORT=3000
+    volumes:
+      - ./.env:/usr/src/app/.env
+    restart: unless-stopped
+
+  db:
+    image: postgres:14
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+      - POSTGRES_DB=hospitaldb
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+    restart: unless-stopped
+
+volumes:
+  postgres_data: