Optimize `dirList` #850

Job	Run time
test / Test Fastify Integration	0s
test / Lint Code	26s
test / Dependency Review	4s
test / Check Licenses	26s
test / Test (14, macos-latest)	1m 24s
test / Test (14, ubuntu-latest)	35s
test / Test (16, macos-latest)	51s
test / Test (16, ubuntu-latest)	30s
test / Test (16, windows-latest)	1m 22s
test / Test (18, macos-latest)	1m 14s
test / Test (18, ubuntu-latest)	34s
test / Test (18, windows-latest)	1m 15s
test / Test (20, macos-latest)	56s
test / Test (20, ubuntu-latest)	34s
test / Test (20, windows-latest)	1m 9s
test / Test (21, macos-latest)	1m 13s
test / Test (21, ubuntu-latest)	37s
test / Test (21, windows-latest)	1m 0s
test / Automerge Dependabot PRs	0s
	14m 10s

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