chore: add Dockerfile and docker-compose (#3)

docker-compose.yml

@@ -0,0 +1,34 @@
+version: '3.8'
+
+services:
+  backend:
+    build:
+      context: ./
+      dockerfile: Dockerfile
+    image: backend_image
+    container_name: backend
+    restart: unless-stopped
+    ports:
+      - '3000:3000'
+    volumes:
+      - .:/app
+    environment:
+      - PORT=3000
+      - DATABASE_URL=postgresql://postgres:postgres@postgres:5432/postgres
+    depends_on:
+      - postgres
+  postgres:
+    image: postgres:latest
+    container_name: postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: postgres
+    ports:
+      - '5432:5432'
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+volumes:
+  pgdata: