Skip if dep is installed (#247)

* Skip if dep is installed

* Format scripts

* Apply copilot suggestion

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: haochengxia

scripts/install_dependency.sh

@@ -194,8 +194,20 @@ install_lightgbm() {
 # Install Zstd
 install_zstd() {
 	log_info "Installing Zstd..."
-	pushd /tmp/ >/dev/null
 	local zstd_version="1.5.0"
+	# Check if Zstd exists
+	if command -v zstd &>/dev/null; then
+		local installed_version
+		installed_version=$(zstd --version | grep -oE 'v[0-9.]+' | sed 's/^v//')
+		if [[ $installed_version == "$zstd_version" ]]; then
+			log_info "Zstd version $zstd_version already installed."
+			return 0
+		else
+			log_info "Zstd is installed but version is $installed_version (expecting $zstd_version). Proceeding to install..."
+		fi
+	fi
+	# Install
+	pushd /tmp/ >/dev/null
 	if [[ ! -f "zstd-${zstd_version}.tar.gz" ]]; then
 		wget "https://github.com/facebook/zstd/releases/download/v${zstd_version}/zstd-${zstd_version}.tar.gz"
 		tar xf "zstd-${zstd_version}.tar.gz"