add langflow workshop module (flows, exercises, solutions)

[hanno-mueller-HPI]

Summary by CodeRabbit

• New Features

  • Added Docker-based Langflow RAG workshop setup with pre-configured service deployment.

• Documentation

  • Added comprehensive setup guide with hardware requirements, prerequisites, and step-by-step instructions.
  • Added environment configuration templates for integrated Langflow, Qdrant, and Ollama services.
  • Added troubleshooting and port configuration guidance.

[coderabbitai]

Caution

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d9800f8e-71c6-4b3e-8526-a3112a2ce7e4

📥 Commits

Reviewing files that changed from the base of the PR and between 2a00442 and 467ed06.

⛔ Files ignored due to path filters (7)

• langflow/pdfs/0010.pdf is excluded by !**/*.pdf
• langflow/pdfs/1-s2.0-S0098135421000594-main.pdf is excluded by !**/*.pdf
• langflow/pdfs/1-s2.0-S0959152412001503-main.pdf is excluded by !**/*.pdf
• langflow/pdfs/Decentralized_control_of_the_Tennessee_E.pdf is excluded by !**/*.pdf
• langflow/pdfs/Downs.pdf is excluded by !**/*.pdf
• langflow/pdfs/rieth_2017_anomaly_detection.pdf is excluded by !**/*.pdf
• langflow/pdfs/self-optimizing-control-of-a-large-scale-plant-the-tennessee-eastman-process.pdf is excluded by !**/*.pdf

📒 Files selected for processing (9)

• langflow/.env.example
• langflow/Dockerfile
• langflow/README.md
• langflow/docker-compose.yml
• langflow/flows/00_ChatBot.json
• langflow/flows/01_RAG_basic.json
• langflow/flows/01_RAG_basic_solution.json
• langflow/flows/02_RAG_memory.json
• langflow/flows/02_RAG_memory_solution.json

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📝 Walkthrough

Walkthrough

A new Langflow RAG workshop environment is configured through environment variables, a custom Docker container, service orchestration via docker-compose, and comprehensive setup documentation. All components work together to provide a ready-to-run local development setup for the workshop.

Changes

Langflow RAG Workshop Infrastructure

Layer / File(s)	Summary
Configuration langflow/.env.example	Environment variables defined for Langflow (port, auto-login, session secret), Qdrant (host, port, collection), and Ollama (host, port, LLM/embed models).
Container Build langflow/Dockerfile	Custom Langflow image (base: langflowai/langflow:1.9.0) installs Python dependencies (qdrant-client, pypdf, sentence-transformers) and sets host/port environment defaults.
Service Orchestration langflow/docker-compose.yml	Docker Compose defines langflow service with build context, image tagging (workshop-ragv2-langflow:1.9.0), port exposure, env file/vars, volume mounts for flows/pdfs/data, and named volume for persistent state.
Documentation & Setup Guide langflow/README.md	Comprehensive README covering prerequisites, hardware/model guidance, model pulling steps, container build/run, verification commands, flow import instructions, folder layout, troubleshooting, and port notes.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 Hops through configs, a workshop takes flight,
Docker and Qdrant dancing just right,
Ollama whispers wisdom so deep,
Langflow flows dancing, secrets to keep—
A rabbit's delight, RAG dreams in sight! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/langflow

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