message: split GITHUB_REPOSITORY rather than using GITHUB_ACTOR
diff: @@ -49,7 +49,8 @@ if [[ "${#BRANCH_ARRAY[@]}" == "1" ]]; then
  if [[ "$GITHUB_REPOSITORY" == "$deforg"* ]]; then
  clone $deforg $defrepo $GITHUB_HEAD_REF
  else
  - clone $GITHUB_ACTOR $defrepo $GITHUB_HEAD_REF
  + REPO_ARRAY=(${GITHUB_REPOSITORY//\// })
  + clone $REPO_ARRAY[0] $defrepo $GITHUB_HEAD_REF
  fi
  else
  clone $deforg $defrepo $BUILDKITE_BRANCH
  