feat: run sudo only if available

run_onchange_before_01_install-packages.sh

@@ -2,15 +2,23 @@
 
 set -euo pipefail
 
+if [ "$(id -u)" -eq 0 ]; then
+    SUDO=""
+elif command -v sudo >/dev/null; then
+    SUDO="sudo"
+else
+    SUDO=""
+fi
+
 echo "Installing packages"
 echo "Updating sources..."
-sudo apt update -qq
+$SUDO apt update -qq
 
 for package in zsh xsel unzip git git-extras neovim git ripgrep pipx age; do
     if dpkg -s "$package" >/dev/null 2>&1; then
         echo $package is already installed.
     else
         echo Installing $package ...
-        sudo apt install -y $package
+        $SUDO apt install -y $package
     fi
 done