build: create legacy binaries

To help transition users relying on exisiting tutorials copy
katapult.bin and katapult.uf2 to canboot.bin and canboot.uf2
respectively.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

Makefile

@@ -83,6 +83,8 @@ $(OUT)katapult.bin: $(OUT)katapult.elf ./scripts/buildbinary.py
 	@echo "  Creating bin file $@"
 	$(Q)$(OBJCOPY) -O binary $< $(OUT)katapult.work
 	$(Q)$(PYTHON) ./scripts/buildbinary.py -b $(CONFIG_FLASH_START) -s $(CONFIG_LAUNCH_APP_ADDRESS) $(BUILDBINARY_FLAGS) $(OUT)katapult.work -c $(OUT)katapult_payload.c $@
+	@echo "  Creating legacy binary $(OUT)canboot.bin"
+	$(Q)cp $@ $(OUT)canboot.bin
 
 $(OUT)katapult_payload.o: $(OUT)katapult.bin
 	@echo "  Compiling $@"

src/rp2040/Makefile

@@ -48,6 +48,8 @@ $(OUT)katapult.uf2: $(OUT)katapult.elf $(OUT)lib/rp2040/elf2uf2/elf2uf2
 ifeq ($(CONFIG_RP2040_ADD_BOOT_SIGNATURE), y)
 	$(Q)$(PYTHON) ./scripts/uf2_append_boot_signature.py --address $(CONFIG_LAUNCH_APP_ADDRESS) --input $(OUT)katapult.uf2 --output $(OUT)katapult.uf2
 endif
+	@echo "  Creating legacy uf2 file $(OUT)canboot.uf2"
+	$(Q)cp $@ $(OUT)canboot.uf2
 
 lib/rp2040_flash/rp2040_flash:
 	@echo "  Building rp2040_flash"