.clone - Contains settings to clone the repository into a container
.options - Global settings that apply to all pipelines
.definitions - Defines resources used elsewhere in the pipeline configuration
.definitions.services - Defines services that run in separate Docker containers
.definitions.caches - Defines custom caches to be used by pipelines
.pipelines - Build pipelines
.pipelines.branches - Branch-specific build pipelines
.pipelines.bookmarks - Bookmark-specific build pipelines (to be used in Mercurial repositories)
.pipelines.custom - Manually triggered build pipelines
.pipelines.tags - Tag-specific build pipelines
.pipelines.pull-requests - Pull-request-specific build pipelines
pipelines.default default