Update app.py

app.py

@@ -1,3 +1,25 @@
+import os
+from pathlib import Path
+
+WRITABLE_BASE = Path(os.environ.get("VIX_CACHE_DIR", "/tmp")).resolve()
+
+# make Path.home() point to /tmp (or your provided VIX_CACHE_DIR)
+os.environ.setdefault("HOME", str(WRITABLE_BASE))
+
+# standard XDG dirs under the writable base
+os.environ.setdefault("XDG_DATA_HOME", str(WRITABLE_BASE / ".local" / "share"))
+os.environ.setdefault("XDG_CACHE_HOME", str(WRITABLE_BASE / ".cache"))
+os.environ.setdefault("XDG_STATE_HOME", str(WRITABLE_BASE / ".local" / "state"))
+
+# ensure they exist
+for p in (
+    Path(os.environ["XDG_DATA_HOME"]),
+    Path(os.environ["XDG_CACHE_HOME"]),
+    Path(os.environ["XDG_STATE_HOME"]),
+):
+    p.mkdir(parents=True, exist_ok=True)
+
+
 import streamlit as st
 import pandas as pd
 import numpy as np