Add scripts to generate raw images

See: https://github.com/kairos-io/kairos/issues/377

tools-image/azure.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Transform a raw image disk to azure vhd
+RAWIMAGE="$1"
+VHDDISK="${2:-disk.vhd}"
+
+MB=$((1024*1024))
+size=$(qemu-img info -f raw --output json "$RAWIMAGE" | gawk 'match($0, /"virtual-size": ([0-9]+),/, val) {print val[1]}')
+# shellcheck disable=SC2004
+ROUNDED_SIZE=$(((($size+$MB-1)/$MB)*$MB))
+echo "Resizing raw image to $ROUNDED_SIZE"
+qemu-img resize -f raw "$RAWIMAGE" $ROUNDED_SIZE
+echo "Converting $RAWIMAGE to $VHDDISK"
+qemu-img convert -f raw -o subformat=fixed,force_size -O vpc "$RAWIMAGE" "$VHDDISK"
+echo "Done"