What does "new build" mean

I notice new UI for 2.0 add a new feature,new build

WX20210531-100416@2x

But I not sure what does it mean,

The promote feature in UI exactly means promote trigger

trigger:
  event:
    - promote
    - rollback

Is there a build event for “new build”?

It means exactly this (below), but you can’t specify commit afaik.

NAME:
   drone build create - create a build

USAGE:
   drone build create [command options] <repo/name>

OPTIONS:
   --commit value           source commit
   --branch value           source branch
   --param value, -p value  custom parameters to be injected into the job environment. Format: KEY=value
   --format value           format output (default: "Number: {{ .Number }}\nStatus: {{ .Status }}\nEvent: {{ .Event }}\nCommit: {{ .After }}\nBranch: {{ .Target }}\nRef: {{ .Ref }}\nAuthor: {{ .Author }} {{ if .AuthorEmail }}<{{.AuthorEmail}}>{{ end }}\nMessage: {{ .Message }}\n")
trigger:
  event:
  - custom

https://docs.drone.io/pipeline/triggers/#by-event
https://docs.drone.io/api/builds/build_create/

Cheers,

Thanks @Pawel_Slotorsz

The doc seems a little bit difficult to read,some important things hide deeply