ci: add api doc generation #1153

Job	Run time
prepare-environment / prepare	2s
Detect which file has changed	5s
python-lint	8s
yaml-lint	6s
markdown-lint	6s
action-lint	6s
documentation	0s
validate-documentation-style	0s
integration-tests-latest-infrahub	0s
unit-tests	0s
validate-generated-documentation	0s
check-api-documentation-obsolescence	0s
	33s

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