n8n with ollama preloaded

[ChillBill77]

Pull Request Title: n8n with Ollama

Description

This pull request adds a complete Docker-based setup for running n8n integrated with a Tailscale sidecar for secure network access, and includes support for Ollama (local LLM inference) integration.

The update introduces:

• A fully configured docker-compose.yml that securely proxies n8n through Tailscale.
• A structured .env file for environment variables and Tailscale authentication.
• A standard config/serve.json enabling HTTPS proxying via Tailscale Serve.
• An updated README.md documenting setup, usage, and troubleshooting steps for n8n and Ollama.

This configuration allows users to:

• Self-host n8n securely on their Tailnet (no public exposure).
• Connect n8n workflows with a local Ollama instance for AI-assisted automation.

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Related Issues

• Fixes Update README.md #42 — Add secure sidecar setup for n8n
• Resolves Fixing PATH issue for Serve #57 — Enable AI integration with Ollama in Docker environment

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Type of Change

• New feature
• Documentation update
• Bug fix
• Refactoring

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How Has This Been Tested?

The configuration was tested on Docker Desktop (v4.33+) and Ubuntu Server (22.04) with Tailscale v1.66.

1. Compose Validation
   • Ran docker compose config to validate YAML and environment variable resolution.
2. Deployment
   • Executed docker compose up -d to verify both n8n and tailscale services start correctly.
3. Connectivity
   • Confirmed Tailnet access to https://<TAILSCALE-HOSTNAME> loads the n8n web interface.
4. Ollama Workflow
   • Verified n8n node successfully communicates with local Ollama API endpoint (http://ollama:11434).

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Checklist

• I have performed a self-review of my code
• I have added configuration and verification tests for the setup
• I have updated necessary documentation (e.g., frontpage README.md)
• Any dependent changes (Ollama integration) have been merged and tested

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Screenshots (if applicable)

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