Fixed `build_cache.path` behaviour / The `--build-path` dir now produ… #4681

Job	Run time
run-determination	1s
check-outdated (./)	8s
check-config (./)	8s
check-formatting (./)	9s
check-style (./)	1m 3s
check-license-headers (./)	11s
build (internal/arduino/discovery/discovery_client)	15s
build (rpc/internal/client_example)	21s
build (commands/term_example)	20s
	2m 36s

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