message: Fix running SNP pipeline against PR manually
diff: @@ -22,9 +22,10 @@ jobs:
  set -ex
  RETRIES=500
  HEAD_SHA=`git rev-parse HEAD`
  - if [ $(System.PullRequest.PullRequestId) != "" ]; then
  + if [ $(Build.SourceBranchName) == "merge" ]; then
  # If this is the case, we're running in a PR, and the SHA we really want is in the
  # commit message of the last commit (which merges it into target)
  + echo "Running in a PR, getting the SHA from the commit message"
  LAST_COMMIT=(`git log -1 --pretty=%B`)
  HEAD_SHA=${LAST_COMMIT[1]}
  fi
  