Use Build Matrix Trimming in (at least) nightly PR validation #7023

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1. github-project-automation

   added this to .NET Dockeron Feb 2, 2026
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4. lbussell commented on Feb 2, 2026

   

   lbussell

   on Feb 2, 2026

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   [Triage] Trimming the pipelines make sense. However, we need to ensure that if tests or pipelines are changed, we validate all images. This could involve updating imageBuilder.PathArgs in the no-cache pipelines to have different paths depending on which paths were changed. Example:

   steps:
   - powershell: |
       $changes = git diff-tree --no-commit-id --name-only -r $(Build.SourceVersion)
       if ($changes -match "^eng/") {
         Write-Host "##vso[task.setvariable variable=EngChanged]true"
       }
       if ($changes -match "^tests/") {
         Write-Host "##vso[task.setvariable variable=TestsChanged]true"
       }
     displayName: 'Detect Changed Paths'
5. lbussell

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