improved os detection

installer.sh

@@ -2,26 +2,20 @@
 
 set -e
 
-# Detect the operating system
 OS=$(awk -F= '/^NAME/{print $2}' /etc/os-release)
 
 # Install Ruby, Nginx, and Git
-case $OS in
-  "CentOS Linux"|"Fedora")
+if [[ $OS == *"CentOS"* ]] || [[ $OS == *"Fedora"* ]]; then
     sudo yum install -y ruby nginx git
-    ;;
-  "Arch Linux")
+elif [[ $OS == *"Arch"* ]]; then
     sudo pacman -Syu --noconfirm ruby nginx git
-    ;;
-  "Debian GNU/Linux"|"Ubuntu"|"Raspbian GNU/Linux")
+elif [[ $OS == *"Debian"* ]] || [[ $OS == *"Ubuntu"* ]] || [[ $OS == *"Raspbian"* ]]; then
     sudo apt-get update
     sudo apt-get install -y ruby nginx git
-    ;;
-  *)
+else
     echo "Unsupported operating system: $OS"
     exit 1
-    ;;
-esac
+fi
 
 # Install the 'webrick' gem
 if ! gem list webrick -i > /dev/null; then