How can Azure DevOps pipelines be set to activate when a pull request is finished?

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To set up Azure DevOps pipelines to activate upon completion of a pull request, the following steps can be followed:

1. Navigate to the Azure DevOps project and choose the repository where the pull request was created.

2. Go to the Pipelines tab in the left sidebar, and then click on the Create Pipeline button.

3. Choose the source of your code, and then select the branch where your pull request was created.

4. Define the pipeline as per your requirements, including the type of project, the environment, the trigger, the agent pool, and so on.

5. On the Triggers page, select the Enable continuous integration checkbox to enable CI for the pipeline.

6. In the Continuous integration (CI) trigger section, choose the branch where your pull request was created and set the trigger to 'Pull request created' and 'Pull request updated'.

7. In the Pull request validation section, choose the validation policy required for the pull request to succeed.

8. Save the pipeline, and it will be activated automatically when a pull request is completed.

In this way, Azure DevOps pipelines can be set to activate when a pull request is finished, and it will help developers to automate their development process and ensure that their releases are more efficient and effective.