[CI] Updates Serverless env

Author: picandocodigo

.buildkite/create-serverless.sh

@@ -20,7 +20,7 @@ run_qaf() {
          -e EC_REGION \
          -e EC_PROJECT_NAME \
          -e VAULT_TOKEN \
-         -e BUILDKITE \
+         -e "BUILDKITE=${BUILDKITE}" \
          -v "$(pwd)/cloud.json:/root/.elastic/cloud.json" \
          docker.elastic.co/appex-qa/qaf:latest \
          bash -c "$cmd"

.buildkite/pipeline.yml

@@ -45,7 +45,7 @@ steps:
       TEST_SUITE: 'serverless'
       RUBY_SOURCE: "{{ matrix.ruby_source }}"
       QUIET: false
-      EC_PROJECT_PREFIX: 'sl_ruby'
+      EC_PROJECT_PREFIX: 'ruby'
       CLOUD_CREDENTIALS_PATH: 'secret/ci/elastic-elasticsearch-ruby/cloud-access'
     matrix:
       setup: