Refactor Dockerfile to simplify ENTRYPOINT syntax

- Change ENTRYPOINT from ["/bin/sh"] to ["sh"] for consistency and clarity
- Maintain compatibility with shell command execution during container runtime

Author: Adriano Sanges

Dockerfile

@@ -16,4 +16,4 @@ RUN apt-get update && apt-get install -y \
 RUN uv --directory real-estate-etl sync --frozen
 RUN uv --directory real-estate-sqlmesh sync --frozen
 
-ENTRYPOINT ["/bin/sh"]
+ENTRYPOINT ["sh"]