buildkite

wait for all other steps to complete first

- command: 'command.sh'
- wait
- command: 'echo The command passed'

create a blocking step

- command: 'command.sh'
- block <label_name>
- command: 'deploy.sh'

This block step will only be available on "master" branches:

- command: 'test.sh'
- block: ':rocket: Release'
  branches: "master"
- command: 'deploy.sh'
  branches: "master"

• https://buildkite.com/docs/agent/build-pipelines