1. name: string  # build numbering format
    2. resources:
    3.   pipelines: [ pipelineResource ]
    4.   containers: [ containerResource ]
    5.   repositories: [ repositoryResource ]
    6. variables: # several syntaxes, see specific section
    7. trigger: trigger
    8. pr: pr
    9. stages: [ stage | templateReference ]

    如果只有一个阶段，可以省略stages关键字并直接指定jobs关键字。