build_docs: add Asciidoctor documentation build support #68

Job	Run time
windows (windows-2019, auto_index contract hana leaf log parameter parameter_python python qvm url)	2h 5m 22s
windows (windows-2022, auto_index contract hana log parameter parameter_python python url)	2h 2m 26s
macos (macos-12, auto_index contract geometry url, --debug)	1s
linux (ubuntu-latest, ubuntu:24.04, python-is-python3, auto_index geometry, --debug, yes)	1h 8m 48s
macos (macos-12, contract geometry url, --debug --boostrelease)	1s
windows (windows-2019, -boostrelease, contract hana log parameter parameter_python python url)	1h 33m 45s
linux (ubuntu-latest, ubuntu:22.04, python2, auto_index geometry url, --debug)	1h 7m 52s
macos (macos-14, auto_index contract geometry url, --debug)	5m 39s
windows (windows-2022, -boostrelease, contract hana log parameter parameter_python python url)	1h 33m 31s
linux (ubuntu-latest, ubuntu:20.04, python, auto_index geometry url, --debug)	1h 10m 46s
macos (macos-14, contract geometry url, --debug --boostrelease)	6m 27s
linux (ubuntu-latest, ubuntu:24.04, python-is-python3, geometry url, --debug --boostrelease)	58m 14s
linux (ubuntu-latest, ubuntu:22.04, python2, geometry url, --debug --boostrelease)	55m 44s
linux (ubuntu-latest, ubuntu:20.04, python, geometry url, --debug --boostrelease)	57m 46s
	13h 46m 22s

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