Enable containerization for simplified deployment and scaling of the app

Adds Dockerfile, docker-compose files, and deployment scripts for containerizing the React/Express app.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 3a22ac80-cd1d-4441-9e36-f24fc2f4c3de
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3478f7c3-db8c-4fca-9165-3adbdf1b5829/e8da43e7-d99c-4328-9fdc-485bdeecffc1.jpg

docker-compose.yml

@@ -0,0 +1,35 @@
+version: '3.8'
+
+services:
+  app:
+    build: .
+    ports:
+      - "5000:5000"
+    environment:
+      - NODE_ENV=production
+      - DATABASE_URL=postgresql://postgres:postgres@db:5432/dj_management
+      - SESSION_SECRET=your-super-secret-session-key-here
+      - REPLIT_DOMAINS=localhost
+      - REPL_ID=your-repl-id
+      - ISSUER_URL=https://replit.com/oidc
+    depends_on:
+      - db
+    volumes:
+      - ./uploads:/app/uploads
+    restart: unless-stopped
+
+  db:
+    image: postgres:15-alpine
+    environment:
+      - POSTGRES_DB=dj_management
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./init.sql:/docker-entrypoint-initdb.d/init.sql
+    restart: unless-stopped
+
+volumes:
+  postgres_data: