Added `--config-dir` flag #4596

Job	Run time
run-determination	1s
check-config (./)	9s
build (internal/arduino/discovery/discovery_client)	15s
check-license-headers (./)	18s
build (rpc/internal/client_example)	26s
check-formatting (./)	8s
check-outdated (./)	10s
build (commands/term_example)	29s
check-style (./)	1m 10s
	3m 6s

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