.github: Use devcontainer for lib alert tree unit-tests #3606

Job	Run time
changed-files	8s
build-devcontainer / build-and-publish-devcontainer	18s
build-shell-ui	0s
build_integration_container_nginx	0s
integration_tests_ui	0s
lint	1m 8s
unit_tests_ui	0s
unit_tests_metalk8s_operator	0s
build-docs	0s
unit_tests_crd_client_generator	0s
unit_tests_shell_ui	0s
unit_tests_storage_operator	0s
unit_tests_lib_alert_tree	0s
unit_tests_salt	0s
build / build-devcontainer / build-and-publish-devcontainer	16s
build / build-shell-ui / shell-ui	51s
build / build	3m 2s
build / build-docs / build-devcontainer / build-and-publish-devcontainer	12s
build / build-docs / docs	2m 12s
build / write-final-status	12s
e2e-tests	1s
write-final-status	7s
	8m 27s

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