[CI] Use custom formatter only in Buildkite

Author: picandocodigo

.buildkite/run-client.sh

@@ -25,6 +25,7 @@ docker run \
        --env "ELASTIC_PASSWORD=${elastic_password}" \
        --env "TEST_SUITE=${TEST_SUITE}" \
        --env "ELASTIC_USER=elastic" \
+       --env "BUILDKITE=true" \
        --volume $repo:/usr/src/app \
        --name elasticsearch-ruby \
        --rm \

elasticsearch-api/spec/spec_helper.rb

@@ -61,7 +61,7 @@ def self.included(context)
   config.add_formatter('documentation')
   config.add_formatter('RspecJunitFormatter', "tmp/elasticsearch-#{ENV['TEST_SUITE']}-#{RUBY_VERSION}-junit.xml")
   config.add_formatter('RSpec::Core::Formatters::HtmlFormatter', "tmp/elasticsearch-#{ENV['TEST_SUITE']}-#{RUBY_VERSION}.html")
-  unless ENV['GITHUB_ACTIONS']
+  if ENV['BUILDKITE']
     require_relative "./rspec_formatter.rb"
     config.add_formatter('RSpecCustomFormatter')
   end