anchor.diff:  
   <h3 class="h3-caps">BUILDKITE_REFSPEC</h3>
   
  -A custom refspec for the buildkite-agent bootstrap script to use when checking out code. This variable can be modified by hooks.
  +A custom refspec for the buildkite-agent bootstrap script to use when checking out code. This variable can be modified by exporting the environment variable in the `environment` or `pre-checkout` hooks.
   
   Example: `"+refs/weird/123abc:refs/local/weird/456"`
   
  
positive.code: 
  <h3 class="h3-caps">BUILDKITE_UNBLOCKER_TEAMS</h3>
  
  A colon separated list of non-private team names that the unblocker belongs to. The value cannot be modified.
  
  Example: `"everyone:platform"`
  
  
negative.code: 
  The name of the user who created the build. The value cannot be modified.
  
  Example: `"Carol Danvers"`
  
  <h3 class="h3-caps">BUILDKITE_BUILD_CREATOR_EMAIL</h3>
  
  The notification email of the user who created the build. The value cannot be modified.
  
  Example: `"cdanvers@kree-net.com"`
  
  <h3 class="h3-caps">BUILDKITE_BUILD_CREATOR_TEAMS</h3>
  
  