Add Alpine Linux/apk-upgrade.sh

A simple script for Alpine Linux that updates the package index, checks for available package upgrades, and optionally performs the upgrade, combining `apk update`, `apk upgrade -s`, and `apk upgrade` into a single interactive workflow.

Alpine Linux/apk-upgrade.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+###
+# For Alpine Linux
+#
+# A convenience script that combines
+# 'apk update', 'apk upgrade -s' and 'apk upgrade'
+#
+# SPDX-License-Identifier: CC0-1.0
+##
+
+# Update the apk cache
+printf "Updating apk cache...\n"
+apk update || exit
+
+# Check for upgradable packages
+printf "\nChecking for upgradable packages..."
+UPGRADABLE=$(apk upgrade -s)
+
+if echo "$UPGRADABLE" | grep -q "Upgrading"; then
+	echo "The following packages can be upgraded:"
+	echo "$UPGRADABLE"
+	echo
+	echo "Do you want to upgrade the packages? [y/N]: "
+	read -r RESPONSE
+	case "$RESPONSE" in
+		[yY][eE][sS]|[yY])
+			echo "Upgrading packages..."
+			apk upgrade
+			;;
+		*)
+			echo "Upgrade cancelled."
+			;;
+	esac
+else
+	echo "No packages to upgrade."
+fi