add full build script

firmware/build_wideband.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# first build the bootloader
+cd bootloader
+./build_bootloader.sh
+cd ..
+
+# delete the elf to force a re-link (it might not pick up the bootloader otherwise)
+rm -r build/
+rm ../for_rusefi/wideband_image.h
+
+make -j12
+
+# Copy the bin without the bootloader (the image consumed by rusEfi has no bootloader on it)
+dd if=build/wideband.bin of=build/wideband_noboot.bin skip=6144 bs=1
+
+# Convert to a header file, and tack "static const " on the front of it
+xxd -i build/wideband_noboot.bin \
+    | cat <(echo -n "static const ") - \
+    > ../for_rusefi/wideband_image.h