Add missing Docker deployment docs

quickstart/selfhost/docker.mdx

@@ -0,0 +1,114 @@
+---
+title: "Deploy with Docker"
+description: "Deploy NextChat using Docker and Docker Compose"
+---
+
+## Quick Start
+
+Run NextChat with a single command:
+
+```bash
+docker run -d -p 3000:3000 \
+  -e OPENAI_API_KEY=sk-xxxx \
+  -e CODE=your-password \
+  yidadaa/chatgpt-next-web
+```
+
+Visit `http://localhost:3000` and use the access code you set.
+
+## Docker Compose
+
+Create a `docker-compose.yml` file:
+
+```yaml
+version: '3'
+services:
+  chatgpt-next-web:
+    image: yidadaa/chatgpt-next-web:latest
+    ports:
+      - "3000:3000"
+    environment:
+      - OPENAI_API_KEY=sk-xxxx
+      - CODE=your-password
+      - PROXY_URL=http://localhost:7890
+    restart: unless-stopped
+```
+
+Start the service:
+
+```bash
+docker-compose up -d
+```
+
+## Environment Variables
+
+See [Environment Variables](/quickstart/selfhost/env) for all available options. Common configurations:
+
+- `OPENAI_API_KEY`: Your OpenAI API key
+- `CODE`: Access password (optional but recommended)
+- `PROXY_URL`: HTTP proxy for API requests
+- `BASE_URL`: Custom API endpoint
+
+## Advanced Configuration
+
+### Using Multiple API Keys
+
+```yaml
+environment:
+  - OPENAI_API_KEY=sk-key1,sk-key2,sk-key3
+```
+
+### Reverse Proxy with Nginx
+
+```nginx
+server {
+    listen 80;
+    server_name chat.example.com;
+
+    location / {
+        proxy_pass http://localhost:3000;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}
+```
+
+### Data Persistence
+
+Mount a volume to persist user settings:
+
+```yaml
+volumes:
+  - ./data:/app/data
+```
+
+## Updating
+
+Pull the latest image and restart:
+
+```bash
+docker-compose pull
+docker-compose up -d
+```
+
+## Troubleshooting
+
+### Container won't start
+Check logs: `docker logs <container-name>`
+
+### API connection issues
+- Verify your API key is valid
+- Check if you need a proxy in your region
+- Ensure the container can reach external networks
+
+### High memory usage
+Add memory limits:
+
+```yaml
+deploy:
+  resources:
+    limits:
+      memory: 512M
+```