Description of problem:

The issue occurs when working with more feature branches on Bitbucket Server it's taking the last commit of the branch and not the merged result from the master branch. 

can not fetch the current changes if the newest commit is a merge commit.

Do not receive the newest commit in {{ revision }} dynamic variable if the newest commit is a merge commit.

Prerequisites (if any, like setup, operators/versions): 1.19

Steps to Reproduce

• Update to OSP 1.19
• Use Bitbucket Server/DC for PAC
• Use Annotations:

    pipelinesascode.tekton.dev/on-event: "[push]"
    pipelinesascode.tekton.dev/on-target-branch: "[refs/tags/*]" 

• upload code, create pull request, and merge commit
• It triggers a PipelineRun

Actual results:

spec:
  params:
    - name: commit-id
      value: "{{revision}}" 

This param {{ revision }} gets last commit of the branch

Expected results:

spec:
  params:
    - name: commit-id
      value: "{{revision}}" 

This param {{ revision }} should get newly merged commit{}

Reproducibility (Always/Intermittent/Only Once): Always

Acceptance criteria: 

Definition of Done:

Build Details:

Additional info (Such as Logs, Screenshots, etc):

 *