Essentially what the subject says. I found this previous question but it doesn't seem very elegant:
Trigger build for PR after Github comment
Have things improved in the meantime?
Actually yes, there is already a better option to use comment triggers to control the automated PR build, especially for the contributions from a forked source repo.
The automated PR build will not be triggered until repository owners and collaborators with Write
permission comment on the pull request with /AzurePipelines run
or /AzurePipelines run <pipeline-name>
.
Hope the information could help.