Add Groq API key as a secret

app.py

@@ -11,7 +11,7 @@ def load_instructions(file):
     return '\n'.join(instructions)
 
 def generate_question(instructions=load_instructions('./instructions.txt')):
-    client = Groq(api_key=os.environ.get('GROQ_API_KEY'))
+    client = Groq(api_key=os.getenv('GROQ_API_KEY'))
     response = client.chat.completions.create(
         model='gemma2-9b-it',
         messages=[