add new temp_dir generation method

app.py

@@ -36,7 +36,8 @@ def predict(pdf, confidence, generate_file):
     document = fitz.open(pdf.name)
     results = []
     images = []
-    tmp_dir = tempfile.gettempdir()
+    tmp_dir = tempfile.TemporaryDirectory().name
+    # tmp_dir = tempfile.gettempdir()
     for page_num, page in enumerate(document, start=1):
         image_pixmap = page.get_pixmap()
         image = image_pixmap.tobytes()