update and test script

base-image-script/alpine-image_pt2.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+echo "[CHROOT] Inside Alpine rootfs"
+
+echo "[CHROOT] Updating system..."
+apk update
+apk upgrade
+
+echo "[CHROOT] Optional cleanup of packages"
+# apk del some-unneeded-package
+
+echo "[CHROOT] Cleaning apk cache..."
+rm -rf /var/cache/apk/*
+
+echo "[CHROOT] Done. Type 'exit' to return to host script."
+exit