fix: install inetutils on Arch Linux

This provides the `hostname` command used in the install.sh script,
which is not available by default on Arch Linux.

Some relevant resources:
- https://bbs.archlinux.org/viewtopic.php?id=125308
- https://archlinux.org/news/deprecation-of-net-tools/
- https://man.archlinux.org/man/hostname.1.en

scripts/install.sh

@@ -160,7 +160,8 @@ echo -e "1. Installing required packages (curl, wget, git, jq, openssl). "
 
 case "$OS_TYPE" in
 arch)
-    pacman -Sy --noconfirm --needed curl wget git jq openssl >/dev/null || true
+    # inetutils provides the 'hostname' command
+    pacman -Sy --noconfirm --needed curl wget git jq openssl inetutils >/dev/null || true
     ;;
 alpine)
     sed -i '/^#.*\/community/s/^#//' /etc/apk/repositories