Add an update script

scripts/update.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+# Update Ubuntu/Debian-based systems
+sudo apt update || true
+sudo apt upgrade -y || true
+# Update the Rust toolchain
+rustup update || true
+# Update the build system source and submodules
+make pull
+# Update the relibc folder timestamp
+touch relibc
+# Update relibc
+make prefix
+# Update recipes
+make rebuild