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Ferric `--verbose` `--concurrency` and `--clean` #925

Job	Run time
Lint	1m 47s
Unit tests (macos-latest)	1m 54s
Unit tests (ubuntu-latest)	1m 36s
Unit tests (windows-latest)	1m 40s
Test ferric Apple triplets	1m 50s
Test app (iOS)	0s
Weak Node-API tests (${{ matrix.runner }})	0s
Test app (macOS)	0s
Test app (Android)	0s
	8m 47s

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