feat: allow a docs directory coming from env

Current config assumes /data/docs to be part of the current data directory.

This allows DOCS_DIR to be mounted from a different path outside of DATA_DIR, or falls back to the previous behaviour if DOCS_DIR is not in the environment

backend/config.py

@@ -162,7 +162,7 @@ Path(CACHE_DIR).mkdir(parents=True, exist_ok=True)
 # Docs DIR
 ####################################
 
-DOCS_DIR = f"{DATA_DIR}/docs"
+DOCS_DIR = os.getenv("DOCS_DIR", f"{DATA_DIR}/docs")
 Path(DOCS_DIR).mkdir(parents=True, exist_ok=True)
 
 
@@ -359,7 +359,7 @@ When answer to user:
 - If you don't know when you are not sure, ask for clarification.
 Avoid mentioning that you obtained the information from the context.
 And answer according to the language of the user's question.
-        
+
 Given the context information, answer the query.
 Query: [query]"""