Is there a way I can set up a build in Azure DevOps to automatically run every time a PR is merged and completed and contains a specific keyword in the name? for example: `"Some PR name here [RUN_BUILD_123]"`

**Edit:**
The reason for this is because I have different builds on top of the same branch so instead of triggering all the builds I just want to trigger those that I know need to be rebuilt based on the particular projects getting changed.