fix: usar adduser do Alpine em vez de useradd

- Imagem litellm/litellm:latest é baseada em Alpine Linux
- Alpine usa adduser, não useradd (Debian/Ubuntu)
- Corrige erro: /bin/sh: useradd: not found

Dockerfile

@@ -14,8 +14,8 @@
 #   - A tiny wrapper entrypoint that runs litellm --config /app/config.yaml
 # ---------------------------------------------------------------
 
-# 1. Use the official LiteLLM image (based on python:3.12-slim)
-FROM litellm/litellm:latest AS base
+# 1. Use the official LiteLLM image (based on Alpine Linux)
+FROM litellm/litellm:latest
 
 # 2. Set environment variables that control the router
 ENV \
@@ -26,10 +26,10 @@ ENV \
   TOOL_ROUTER_ALWAYS_INCLUDE=get_time,help,list_tools \
   TOOL_ROUTER_EMBEDDING_MODEL=text-embedding-3-small
 
-# 3. Create a non-root user (optional but recommended)
-RUN useradd -m litellm && \
+# 3. Create a non-root user (Alpine uses adduser, not useradd)
+RUN adduser -D -u 1000 litellm && \
     mkdir -p /app && \
-    chown litellm:litellm /app
+    chown -R litellm:litellm /app
 
 # 4. Switch to that user for the rest of the steps
 USER litellm