.github: Use devcontainer for lib alert tree unit-tests #3614

Job	Run time
changed-files	10s
build-devcontainer / build-and-publish-devcontainer	7m 14s
build_integration_container_nginx	2m 31s
build-shell-ui	0s
integration_tests_ui	6m 24s
lint	2m 40s
unit_tests_crd_client_generator	1m 7s
build-docs	0s
unit_tests_lib_alert_tree	1m 0s
unit_tests_metalk8s_operator	2m 40s
unit_tests_salt	1m 47s
unit_tests_shell_ui	1m 34s
unit_tests_storage_operator	2m 22s
unit_tests_ui	2m 38s
build / build-devcontainer / build-and-publish-devcontainer	14s
build / build-shell-ui / shell-ui	55s
build / build	2m 16s
build / build-docs / build-devcontainer / build-and-publish-devcontainer	15s
build / build-docs / docs	1m 55s
build / write-final-status	12s
e2e-tests	1s
write-final-status	8s
	38m 3s

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