Update app.py

app.py

@@ -1,5 +1,7 @@
 from cryptography.fernet import Fernet
-key = b'c9PGl7mpWfZDOCo67ZymRG_mCFZmifdFusN1E5nXs0o='
+import os 
+
+key = os.getenv('ENCRYPTION_KEY').encode('utf-8')
 cipher = Fernet(key)
 
 files = ['mirascope_extractor.enc', 'pdf_to_image.enc', 'image_to_text.enc', 'run_app.enc']