Add WebUI-3 as an option to the manifest #865

Job	Run time
tests (ubuntu-latest, tests)	34s
build (ubuntu-latest, noradio)	2m 6s
tests (macos-latest, tests)	47s
build (ubuntu-latest, wifi)	2m 17s
tests (windows-latest, tests_nosan)	1m 17s
build (ubuntu-latest, bt)	2m 5s
build (macos-latest, noradio)	2m 6s
build (macos-latest, wifi)	2m 17s
build (macos-latest, bt)	1m 57s
build (windows-latest, noradio)	4m 14s
build (windows-latest, wifi)	5m 14s
build (windows-latest, bt)	4m 25s
	29m 19s

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