Commits on Dec 17, 2019

1. Add workspace types for Task and TaskRun with validation …

   This allows users to use Volumes with Tasks such that:
   - The actual volumes to use (or subdirectories on those volumes) are
     provided at runtime, not at Task authoring time
   - At Task authoring time you can declare that you expect a volume to
     be provided and control what path that volume should end up at
   - Validation will be provided that the volumes (workspaces) are actually
     provided at runtime
   
   Before this change, there were two ways to use Volumes with Tasks:
   - VolumeMounts were explicitly declared at the level of a step
   - Volumes were declared in Tasks, meaning the Task author controlled the
     name of the volume being used and it wasn't possible at runtime to use
     a subdir of the volume
   - Or the Volume could be provided via the podTemplate, if the user
     realized this was possible
   
   None of this was validated and could cause unexpected and hard to
   diagnose errors at runtime.
   
   It's possible folks might be specifying volumes already in the Task or
   via the stepTemplate that might collide with the names we are using for
   the workspaces; instead of validating this and making the Task author
   change these, we can instead randomize them!
   
   We have also limited (at least initially) the types of volume source
   being supported instead of expanding to all volume sources, tho we can
   expand it later if we want to and if users need it. This would reduce
   the API surface that a Tekton compliant system would need to conform to
   (once we actually define what conformance means!).
   
   Part of tektoncd#1438
   
   In future commits we will add support for workspaces to Pipelines and
   PipelineRuns as well; for now if a user tries to use a Pipeline with a
   Task that requires a Workspace, it will fail at runtime because it is
   not (yet) possible for the Pipeline and PipelineRun to provide
   workspaces.
   
   Co-authored-by: Scott <sbws@google.com>

   

   bobcatfish and Scott committed Dec 17, 2019
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