Add Shell Script Handling to .gitattributes

[nativegold]

When entrypoint.sh is edited on Windows, the file may end up with Windows-style line endings (CRLF).
This can cause the script to fail when the Docker container starts, because the shell inside the container expects Unix-style line endings (LF).

To prevent this, we should update .gitattributes to ensure all shell scripts use LF:

*.sh text eol=lf

This will guarantee that entrypoint.sh (and any other .sh files) work correctly in Docker environments regardless of the host OS.