ci: consolidate rust + protoc install across workflows (#23700)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/ci/utils/install_protoc.sh

@@ -18,7 +18,7 @@ ARCH=$(uname -m)
 if command -v apt-get &> /dev/null; then
     # Ubuntu/Debian
     apt-get update || true # May fail due to unrelated broken packages
-    PROTOC_APT_PACKAGES=(wget unzip gcc g++ perl make)
+    PROTOC_APT_PACKAGES=(wget unzip)
     apt-get install -y --no-install-recommends "${PROTOC_APT_PACKAGES[@]}" || {
         echo "Warning: apt-get install failed, checking if required packages are available..."
         for pkg in "${PROTOC_APT_PACKAGES[@]}"; do
@@ -32,9 +32,9 @@ if command -v apt-get &> /dev/null; then
 elif command -v yum &> /dev/null; then
     # RHEL/CentOS
     yum update -y
-    yum install -y wget unzip gcc gcc-c++ perl-core make
+    yum install -y wget unzip
 else
-    echo "ERROR: Neither apt-get nor yum found; cannot install protoc build deps"
+    echo "ERROR: Neither apt-get nor yum found; cannot install protoc"
     exit 1
 fi
 

scripts/ci/utils/install_rust_protoc.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Install protoc and a Rust toolchain (rustup/cargo). Required by setuptools-rust
+# to build the bundled native gRPC extension (rust/sglang-grpc) when installing
+# the main `sglang` wheel from source. Idempotent — both helpers no-op if
+# already installed.
+#
+# protoc installs system-wide (/usr/local) and apt deps, so it needs root.
+# rustup installs per-user under $HOME/.cargo, so it must run as the calling
+# user (running it under sudo would put cargo in /root/.cargo and the rest of
+# the job wouldn't find it).
+set -euxo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+if [ "$(id -u)" = "0" ]; then
+    SUDO=""
+elif command -v sudo >/dev/null 2>&1; then
+    SUDO="sudo"
+else
+    SUDO=""
+fi
+
+${SUDO} bash "${SCRIPT_DIR}/install_protoc.sh"
+bash "${SCRIPT_DIR}/install_rustup.sh"