Trigger a pull-requests pipeline manually from the UI for a specific PR (instead of branch)

Problem Definition

When triggering a pipeline manually (from the Pipelines page of a repo > Run pipeline) there is no option to run a pull-requests pipeline for a certain PR. Pipelines can be triggered only for a specific branch.

Some users who have pull-requests pipelines may use the [skip ci] option on commits and they want to be able to run a pull-requests pipeline manually for a certain PR.

Running a pull-requests pipeline for a branch does not have the same behavior as running it for a PR (where the PR branches are merged during the build and the PR default variables are available).

Suggested Solution

Provide users the option to select a certain PR when triggering a pull-requests pipeline manually from the UI.

Workaround

There are two workarounds at the moment:

1. Trigger a pull-requests pipeline via API:

https://developer.atlassian.com/cloud/bitbucket/rest/api-group-pipelines/#trigger-a-pull-request-pipeline

This will work even if the last commit of the source branch has [skip ci] in its message.

2. In a clone of the repo, create an empty commit on the source branch without the [skip ci] option:

git commit --allow-empty -m "Empty commit to trigger the pull-requests pipeline"

When that empty commit is pushed to the source branch, the pull-requests pipeline will be triggered.