Fix api key error on HuggingFace (#11)

* fix: API Key error on LLM

* Update workflows for using variables

.github/workflows/hugging-face-deployment.yml

@@ -17,4 +17,5 @@ jobs:
       - name: Push to hub
         env:
           HF_TOKEN: ${{ secrets.HF_TOKEN }}
-        run: git push --force https://maclenn77:$HF_TOKEN@huggingface.co/spaces/maclenn77/pdf-explainer main
+          HF_USERNAME: ${{ secrets.HF_USERNAME }}
+        run: git push --force https:/$HF_USERNAME:$HF_TOKEN@huggingface.co/spaces/$HF_USERNAME/pdf-explainer main

app.py

@@ -50,7 +50,7 @@ chroma_db = ChromaDB(openai.api_key)
 openai_client, collection = settings.build(chroma_db)
 
 # Create Agent
-llm = ChatOpenAI(temperature=0.9, model="gpt-3.5-turbo-16k")
+llm = ChatOpenAI(temperature=0.9, model="gpt-3.5-turbo-16k", api_key=openai.api_key)
 agent = PDFExplainer(llm, chroma_db).agent
 
 # Main