message: Only build docs on master/staging/trying
diff: @@ -192,6 +192,7 @@ jobs:
  vmImage: "ubuntu-16.04"
  variables:
  rust_toolchain: nightly-2019-08-15
  + condition: in(variables['Build.SourceBranch'], 'refs/heads/master', 'refs/heads/staging', 'refs/heads/trying')
  steps:
  - checkout: self
  submodules: true
  