feat: support HF_HOME/_ENDPOINT env for Hugging Face models (#2642)

Signed-off-by: Hyeonki Hong <hhk7734@gmail.com>
Signed-off-by: Krishnan Prashanth <kprashanth@nvidia.com>

Author: hhk7734

lib/llm/src/hub.rs

@@ -42,7 +42,7 @@ fn is_weight_file(filename: &str) -> bool {
 pub async fn from_hf(name: impl AsRef<Path>, ignore_weights: bool) -> anyhow::Result<PathBuf> {
     let name = name.as_ref();
     let token = env::var(HF_TOKEN_ENV_VAR).ok();
-    let api = ApiBuilder::new()
+    let api = ApiBuilder::from_env()
         .with_progress(true)
         .with_token(token)
         .high()