build: add directory-oriented make workflows

firmware/tools/configurator/Makefile

@@ -0,0 +1,32 @@
+override SHELL := /bin/sh
+override MAKEFLAGS += --no-print-directory
+
+.DEFAULT_GOAL := help
+.DELETE_ON_ERROR:
+
+override CARGO := cargo
+override CARGO_FLAGS := --locked --offline
+
+override PRIMARY_GOAL := $(firstword $(MAKECMDGOALS))
+
+ifeq ($(PRIMARY_GOAL),run)
+
+.PHONY: run
+
+.DEFAULT:
+	@:
+
+else
+
+.PHONY: help run
+
+help: ## Show configurator commands
+	@printf '%s\n' 'Configurator' '' \
+		'The root Makefile passes every argument after -- to the application:' \
+		'  make firmware/tools/configurator -- --source-system 255 --serial /dev/ttyUSB0 --baud 115200'
+
+endif
+
+run: ## Run the configurator with the remaining command-line arguments
+	@exec python3 ../../../scripts/make-argv.py exec run \
+		$(CARGO) run $(CARGO_FLAGS) -p kaptan-configurator --