Warn against using add-* flags in production #165

Job	Run time
Shellcheck	27s
Build (m4) on ubuntu-latest	3m 6s
Build (m4) on windows-latest	6m 30s
Build (legacy) on macos-latest	2m 47s
Build (legacy) on ubuntu-latest	2m 51s
Build (legacy) on windows-latest	5m 38s
Build (m4) on macos-latest	3m 11s
Generate and Deploy Documentation	29s
	24m 59s

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