Buildkite Status: Correct filtering of builds

Previously the post-commit builds would have branch
main. Now they have branch master, of the pre-commit checks
repo.

Instead of looking for the branch, just look for the
Phabricator review number in the env. Any build without
that is post commit.

Change-Id: I80214d5c29922dd60daf250b7a927085d7657016
1 file changed
tree: d3edd131f5bb07529616f0798fcfc60e657ca3e1
  1. bisect/
  2. helpers/
  3. monitor/
  4. release/
  5. stress/
  6. test-suite/
  7. .gitreview
  8. README.txt