Makefile: add a target to build the iso image

Makefile

@@ -1,7 +1,14 @@
 #!/usr/bin/make -f
 
-all: install_buildenv
+all: install_buildenv build
 
 install_buildenv:
 	# Install packages required to build the image
 	sudo apt install live-build make build-essential wget git xmlstarlet unzip colordiff shellcheck apt-transport-https rename ovmf rsync
+
+build:
+	# Build the live system/ISO image
+	#sudo lb clean --purge #only required when changing the mirrors/architecture config
+	sudo lb clean --all
+	sudo lb config
+	sudo lb build