Added `--config-dir` flag #4595

Job	Run time
run-determination	1s
check-outdated (./)	13s
check-config (./)	8s
check-formatting (./)	9s
check-style (./)	44s
build (internal/arduino/discovery/discovery_client)	19s
check-license-headers (./)	17s
build (rpc/internal/client_example)	24s
build (commands/term_example)	21s
	2m 36s

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