install: allow busybox unzip

according to issue #172, `busybox unzip` is an alternative to
installing unzip or 7z.

busybox is installed by default on Ubuntu 24.04.1 LTS but unzip/7z are not.

note: busybox is not installed on macOS 15.3 by default but unzip is.

install.sh

@@ -4,8 +4,8 @@
 
 set -e
 
-if ! command -v unzip >/dev/null && ! command -v 7z >/dev/null; then
-	echo "Error: either unzip or 7z is required to install Deno (see: https://github.com/denoland/deno_install#either-unzip-or-7z-is-required )." 1>&2
+if ! command -v unzip >/dev/null && ! command -v busybox unzip > /dev/null && ! command -v 7z >/dev/null; then
+	echo "Error: either unzip or busybox unzip or 7z are required to install Deno (see: https://github.com/denoland/deno_install#either-unzip-or-7z-is-required )." 1>&2
 	exit 1
 fi
 
@@ -79,6 +79,8 @@ fi
 curl --fail --location --progress-bar --output "$exe.zip" "$deno_uri"
 if command -v unzip >/dev/null; then
 	unzip -d "$bin_dir" -o "$exe.zip"
+elif command -v busybox >/dev/null; then
+	busybox unzip -d "$bin_dir" -o "$exe.zip"
 else
 	7z x -o"$bin_dir" -y "$exe.zip"
 fi