Added ability to request the hf token be writable, in combination with new environment secret

src/common.py

@@ -33,11 +33,14 @@ def pop_n(items: List, n: int) -> List:
     return popped[::-1]
 
 
-def hf_api_token() -> str:
+def hf_api_token(write: bool = False) -> str:
     """
     Utility single access point to look up the hugging face access token.
     """
-    token = st.secrets['hf_token']
+    if write:
+        token = st.secrets['hf_write_token']
+    else:
+        token = st.secrets['hf_token']
     if token is None:
         raise ValueError('No HF access token found in streamlit secrets')
     return token