SWPROT-8953: build: Add run rule

Origin: SiliconLabsSoftware#41
Signed-off-by: Philippe Coval <philippe.coval@silabs.com>

Author: rzr

helper.mk

@@ -92,14 +92,15 @@ cmake_options+=-DCARGO_TARGET_TRIPLE="${CARGO_TARGET_TRIPLE}"
 export CMAKE_TARGET_TRIPLE
 endif
 
+run_file?=${build_dir}/applications/zpc/zpc
 
 help: ./helper.mk
 	@echo "# ${project}: ${url}"
 	@echo "#"
 	@echo "# Usage:"
 	@echo "#  ${<D}/${<F} setup # To setup developer system (once)"
 	@echo "#  ${<D}/${<F} VERBOSE=1 # Default build tasks verbosely (depends on setup)"
-	@echo "#  ${<D}/${<F} # For more info"
+	@echo "#  ${<D}/${<F} help/all # For more info"
 	@echo "#"
 
 help/all: README.md NEWS.md
@@ -234,6 +235,9 @@ all: ${build_dir}/CMakeCache.txt
 ${build_dir}/%: all
 	file -E "$@"
 
+${build_dir}: ${build_dir}/CMakeCache.txt
+	file -E "$<"
+
 test: ${build_dir}
 	ctest --test-dir ${<}/${project_test_dir}
 
@@ -260,6 +264,10 @@ prepare: git/prepare
 all/default: configure prepare all test dist
 	@date -u
 
+run_args?=--help
+run:
+	file -E ${run_file}
+	${run_file} ${run_args}
 
 ### @rootfs is faster than docker for env check
 
@@ -312,7 +320,7 @@ docker_url?=${url}.git\#${docker_branch}
 docker/%: Dockerfile
 	time docker run "${project}:latest" -C "${docker_workdir}" "${@F}"
 
-test/docker: distclean prepare/docker docker/help docker/test
+test/docker: distclean prepare/docker docker/help docker/test docker/run
 	@echo "# ${project}: log: $@: done: $^"
 
 test/docker/build: