Add RAG functionality to Copilot

[K-Schubert]

Overview

Added a simple RAG functionality to the EAK-Copilot.

Issue Reference:

• 79

• 105

• 107

• 97

• 134

• 110

• 135

• 112

Changes Made

• Added rag/app/main.py to implement the /init_expert, /get_docs, /rerank and /embed endpoints.
• Added rag/app/models.py to implement the ResponseBody and RAGRequest model classes.
• Added rag/app/test_semantic_search.py to run a simple semantic search query.
• Added rag/Dockerfile to build the rag image.
• Added rag/requirements.txt.
• Updated docker-compose.yml to include the rag service.
• Updated .env.example to include the postgresql port number.
• Updated the README.md.

Testing

• Tested endpoints manually through swagger docs at localhost:8010/docs.
• Removed the db/data folder to index docs from scratch.
• Ran rag/app/test_semantic_search.py.

Screenshots

None

Additional Notes

• Crawling/Scraping/Indexing of fedlex.ch, ahv-iv.ch, zas.admin.ch and bsv.admin.ch will be implemented in a future sprint. For the moment only dummy data is indexed.
• Auto data crawling/scraping/indexing will be configured from the main config.yaml file in the future (for the moment this process is manual).

Requested Reviewers

@tabee