add azure artifact from build pipeline to release pipeline code example

Example 1: release pipeline cannot access artifact

steps:
- publish: $(System.DefaultWorkingDirectory)/bin/WebApp
  artifact: WebApp

Example 2: release pipeline cannot access artifact

steps:
- task: PublishPipelineArtifact@1
  inputs:
    path: $(System.DefaultWorkingDirectory)/bin/WebApp
    artifact: WebApp