Commits on Sep 8, 2020

1. Implement When Expressions …

   Adding `WhenExpressions` used to efficiently specify guarded execution
   of `Tasks`, without spinning up new pods. We use `WhenExpressions` to
   avoid adding an opinionated and complex expression language to the Tekton
   API to ensure Tekton can be supported by as many systems as possible.
   Further details about the design are in [Conditions Beta TEP](https://github.com/tektoncd/community/blob/master/teps/0007-conditions-beta.md).
   
   The components of `WhenExpressions` are `Input`, `Operator`
   and `Values`:
   - `Input` is the input for the `Guard` checking which can be static
   inputs or variables, such as `Parameters` or `Results`.
   - `Operator` represents an `Input`'s relationship to a set of `Values`.
   `Operators` we will use in `WhenExpressions` are `In` and `NotIn`.
   - `Values` is an array of string values. The `Values` array must be
   non-empty. It can contain static values or variables (`Parameters` or
   `Results`).
   
   The declared `WhenExpressions` are evaluated before the `Task` is run.
   If all the `WhenExpressions` evaluate to `True`, the `Task` is run.
   If any of the `WhenExpressions` evaluate to `False`, the `Task` is
   skipped. When a `Task` is skipped, it's included in the `Skipped Tasks`
   section of the `PipelineRunStatus`.

   

   jerop committed Sep 8, 2020
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