.github: Use devcontainer for lib alert tree unit-tests #3613

Job	Run time
changed-files	8s
build-devcontainer / build-and-publish-devcontainer	9m 6s
build_integration_container_nginx	2m 37s
build-shell-ui	0s
integration_tests_ui	6m 44s
lint	3m 20s
unit_tests_ui	2m 56s
build-docs	0s
unit_tests_crd_client_generator	1m 8s
unit_tests_metalk8s_operator	3m 10s
unit_tests_salt	1m 51s
unit_tests_shell_ui	1m 42s
unit_tests_storage_operator	2m 26s
unit_tests_lib_alert_tree	54s
build / build-devcontainer / build-and-publish-devcontainer	8s
build / build-shell-ui / shell-ui	1m 6s
build / build	10m 11s
build / build-docs / build-devcontainer / build-and-publish-devcontainer	14s
build / build-docs / docs	2m 5s
build / write-final-status	10s
e2e-tests	0s
write-final-status	8s
	50m 4s

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