Commits on Aug 11, 2021

1. Skipping Strategies …

   This change implements skipping strategies to give users the flexibility
   to skip a single guarded Task only and unblock execution of its
   dependent Tasks.
   
   Today, WhenExpressions are specified within Tasks but they guard the
   Task and its dependent Tasks. To provide flexible skipping strategies,
   we want to change the scope of WhenExpressions from guarding a Task and
   its dependent Tasks to guarding the Task only. If a user wants to guard
   a Task and its dependent Tasks, they can:
   - cascade the WhenExpressions to the dependent Tasks
   - compose the Task and its dependent Tasks as a sub-Pipeline that's
   guarded and executed together using Pipelines in Pipelines (but this is
   still an experimental feature)
   
   Changing the scope of WhenExpressions to guard the Task only is
   backwards-incompatible, so to make the transition smooth:
   - we'll provide a feature flag, scope-when-expressions-to-task, which:
     - will default to false to guard a Task and its dependent Tasks
     - can be set to true to guard a Task only
   - after migration, we'll change the global default for the feature flag
   to true to guard a Task only by default
   - eventually, we'll remove the feature flag and guard a Task only going
   forward
   
   Implements [TEP-0059: Skipping Strategies](https://github.com/tektoncd/community/blob/main/teps/0059-skipping-strategies.md)
   Closes tektoncd#2127

   

   jerop committed Aug 11, 2021
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