[router] Allow empty worker list for sglang.launch_router (#2979)

scripts/ci_install_rust.sh

@@ -1,9 +1,14 @@
 #!/bin/bash
 set -euxo pipefail
 
-# these are required for actix
-apt-get update
-apt-get install -y libssl-dev pkg-config
+# Check if sudo is available
+if command -v sudo >/dev/null 2>&1; then
+    sudo apt-get update
+    sudo apt-get install -y libssl-dev pkg-config
+else
+    apt-get update
+    apt-get install -y libssl-dev pkg-config
+fi
 
 # Install rustup (Rust installer and version manager)
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y