Looking at the repo context, I need to create a Dockerfile for serving an HTML file with Nginx. Based on the file tree, I can see there are `branding.html` files in the businesses directories. I'll create a general-purpose Dockerfile that serves HTML content, placing it at the root level (or a logical web-serving location).

Since there's a `businesses/00-sns-holding/branding.html` and `businesses/01-networking/branding.html`, I'll create the Dockerfile at the root with a simple default HTML file, following the project's clean style.

```json
{
  "files": {
    "Dockerfile": "# SNS Network Solutions — Static web server\n# Serves the SNS holding branding page via Nginx.\n# Build:  docker build -t sns-web .\n# Run:    docker run -p 8080:80 sns-web\n\nFROM nginx:1.27-alpine\n\n# Remove the default Nginx placeholder page\nRUN rm -rf /usr/share/nginx/html/*\n\n# Copy the SNS holding branding page as the site root index\nCOPY businesses/00-sns-holding/branding.html /usr/share/nginx/html/index.html\n\n# Copy any additional HTML assets if present\nCOPY businesses/01-networking/branding.html /usr/share/nginx/html/networking.html\n\n# Expose standard HTTP port\nEXPOSE 80\n\n# Nginx starts in the foreground by default in the official image\nCMD [\"nginx\", \"-g\", \"daemon off;\"]\n",
    ".dockerignore": "# Exclude files that don't belong in the build context\n.git\n.env\n*.env\nai-core/state/\nnode_modules/\n__pycache__/\n*.pyc\n*.pyo\n*.log\n"
  },
  "commit_message": "feat: add Dockerfile to serve SNS HTML files via Nginx"
}
```