scripts: create helper script for DFU generation

Signed-off-by: Onur Özkan <work@onurozkan.dev>

scripts/create-dfu-image.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -ne 2 ]]; then
+    printf 'Usage: %s <input.elf> <output.bin>\n' "$0" >&2
+    exit 2
+fi
+
+readonly input_elf="$1"
+readonly output_image="$2"
+readonly host="$(rustc -vV | sed -n 's/^host: //p')"
+readonly llvm_objcopy="$(rustc --print sysroot)/lib/rustlib/$host/bin/llvm-objcopy"
+
+if [[ ! -x "$llvm_objcopy" ]]; then
+    printf 'llvm-objcopy is unavailable; install it with: rustup component add llvm-tools-preview\n' >&2
+    exit 1
+fi
+
+"$llvm_objcopy" -O binary "$input_elf" "$output_image"
+printf 'DFU image: %s\n' "$output_image"