Warn against using add-* flags in production #171

Job	Run time
Shellcheck	29s
Build (m4) on macos-latest	3m 12s
Build (legacy) on ubuntu-latest	3m 14s
Build (legacy) on macos-latest	2m 37s
Build (legacy) on windows-latest	6m 2s
Build (m4) on ubuntu-latest	3m 6s
Build (m4) on windows-latest	6m 13s
Generate and Deploy Documentation	36s
	25m 29s

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