fix: clear /etc/legal to remove Ubuntu warranty notice from terminal

entrypoint.py

@@ -442,6 +442,8 @@ def setup_motd():
     """Replace Ubuntu MOTD with clean HuggingRun banner."""
     sh("chmod -x /etc/update-motd.d/* 2>/dev/null")
     sh("rm -f /run/motd.dynamic")
+    # Clear Ubuntu legal notice
+    open("/etc/legal", "w").close()
     motd = (
         "\n"
         "\x1b[38;5;39m"