linux-install-packages: 優化更新套件庫清單作法

.chezmoiscripts/run_onchange_before_linux-install-packages.sh.tmpl

@@ -72,14 +72,14 @@ for package in "${pacmanForce_packages[@]}"; do
   to_install_pacmanForce+=("$package")
 done
 
-sudo pacman -Sy
-
 # 等待鎖定檔案被移除
 wait_for_pacman_unlock
 
 if [[ ${#to_install_pacmanForce[@]} -gt 0 ]]; then
   echo "  - Installing missing packages via pacman: ${to_install_pacmanForce[@]}"
-  sudo pacman -S --needed --noconfirm "${to_install_pacmanForce[@]}"
+  sudo pacman -Sy --needed --noconfirm "${to_install_pacmanForce[@]}"
+else
+  sudo pacman -Sy
 fi
 
 # 等待鎖定檔案被移除