misc: report full traceback + env config

Dockerfile

@@ -6,9 +6,13 @@ ARG APP_CODE=/app
 ARG APP_DATA=/data/app
 ARG HF_HOME=/data/huggingface
 
-ENV APP_CODE $APP_CODE
-ENV APP_DATA $APP_DATA
-ENV HF_HOME $HF_HOME
+ENV APP_CODE=$APP_CODE \
+    APP_DATA=$APP_DATA \
+    HF_HOME=$HF_HOME
+ENV PYTHONUNBUFFERED=1 \
+	SYSTEM=spaces      \
+	SHELL=/bin/bash
+
 
 COPY ./requirements.txt $APP_CODE/requirements.txt
 COPY ./packages.txt $APP_CODE/packages.txt

src/app.py

@@ -20,7 +20,7 @@ def cached_download_csv(url : str, **kwargs) -> pd.DataFrame:
     try:
         s = shelve.open(shelf_filename, writeback=True, flag='c')
     except Exception as exn:
-        st.warning("Unexpected exception, by-passing persistent cache :\n" + str(exn))
+        st.warning("Unexpected exception, by-passing persistent cache :\n" + exn.with_traceback())
         return pd.read_csv(url, **kwargs)
     with s as shelf:
         st.info(f"Opened or created the shelf file '{shelf_filename}'")