added guardrails

Dockerfile

@@ -15,6 +15,16 @@ RUN pip install --no-cache-dir --upgrade -r app/requirements.txt
 # ^ no caching of the packages to save space
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
 
+# pip install guardrails-ai first
+# https://huggingface.co/docs/hub/spaces-sdks-docker#secrets
+RUN --mount=type=secret,id=GUARDRAILS_TOKEN,mode=0444,required=true \
+  guardrails configure --token $(cat /run/secrets/GUARDRAILS_TOKEN) --no-metrics True
+RUN guardrails hub install hub://guardrails/regex_match
+RUN guardrails hub install hub://guardrails/toxic_language
+RUN guardrails hub install hub://guardrails/detect_pii
+RUN guardrails hub install hub://guardrails/qa_relevance_llm_eval
+
+
 # RUN python -c "import nltk; nltk.download('stopwords')"
 # ^ to fix runtime error, see https://github.com/run-llama/llama_index/issues/10681
 # it didn't work, I had to do chmod below (as also suggested in the article)

app/requirements.txt

@@ -1,8 +1,8 @@
 requests==2.31.0
 pydantic==2.7.1
 pydantic_core==2.18.2
-fastapi
-uvicorn[standard]
+fastapi==0.110.0
+uvicorn==0.20.0
 pdfplumber==0.11.0
 weaviate-client==4.5.4
 PyPDF2==3.0.1
@@ -21,4 +21,8 @@ langchain-community==0.0.38
 langchain-core==0.1.52
 langchain-text-splitters==0.0.1
 python-multipart==0.0.9
-tenacity==8.2.3
+tenacity==8.2.3
+typer
+# https://hub.guardrailsai.com/tokens
+guardrails-ai<=0.4.2   # API KEY doesn not work above that version
+loguru==0.7.2    # used in reranker