Updated install script

Signed-off-by: GitHub Actions Bot <41898282+github-actions[bot]@users.noreply.github.com>

assets/install.sh

@@ -0,0 +1,82 @@
+#!/bin/sh
+set -eu
+
+info() {
+    echo "$@" >&2
+}
+
+error() {
+	echo "$@" >&2
+	exit 1
+}
+
+get_os() {
+	os="$(uname -s)"
+	if [ "$os" = Darwin ]; then
+		echo "macos"
+	elif [ "$os" = Linux ]; then
+		echo "linux"
+	else
+		error "unsupported OS: $os"
+	fi
+}
+
+get_arch() {
+	arch="$(uname -m)"
+	if [ "$arch" = x86_64 ]; then
+		echo "x64"
+	elif [ "$arch" = aarch64 ] || [ "$arch" = arm64 ]; then
+		echo "arm64"
+	else
+		error "unsupported architecture: $arch"
+	fi
+}
+
+download_file() {
+	url="$1"
+	filename="$(basename "$url")"
+	cache_dir="$(mktemp -d)"
+	file="$cache_dir/$filename"
+
+	info "Scaffoldizr: installing scfz..."
+
+	if command -v curl >/dev/null 2>&1; then
+		curl -#fLo "$file" "$url"
+	else
+		if command -v wget >/dev/null 2>&1; then
+			stderr=$(mktemp)
+			wget -O "$file" "$url" >"$stderr" 2>&1 || error "wget failed: $(cat "$stderr")"
+		else
+			error "scfz standalone install requires curl or wget but neither is installed. Aborting."
+		fi
+	fi
+
+	echo "$file"
+}
+
+install_tool() {
+	# download the tarball
+	version="v0.2.0-beta-2"
+    repo="arch-formula/scaffoldizr"
+	os="$(get_os)"
+	arch="$(get_arch)"
+	install_path="${SCFZ_INSTALL_PATH:-$HOME/.local/bin/scfz}"
+	install_dir="$(dirname "$install_path")"
+	tarball_url="https://github.com/${repo}/releases/download/${version}/scfz-${version}-${os}-${arch}.tar.gz"
+
+	cache_file=$(download_file "$tarball_url")
+
+    # TODO: Validate checksum
+	# cd "$(dirname "$cache_file")" && get_checksum | "$(shasum_bin)" -c >/dev/null
+
+	# extract tarball
+	mkdir -p "$install_dir"
+	rm -rf "$install_path"
+	cd "$(mktemp -d)"
+	tar -xzf "$cache_file"
+	mv "${os}-${arch}/scfz" "$install_path"
+	info "Scaffoldizr: installed successfully to $install_path"
+    info "Make sure that \"$install_dir\" is in your \$PATH"
+}
+
+install_tool