bk(smart exhaustive tests): tune the steps to support GH comments and changesets

.buildkite/smart_exhaustive_tests_pipeline.yml

@@ -1,6 +1,6 @@
 steps:
   - label: "Trigger logstash-exhaustive-tests-pipeline for PRs with qa/acceptance/ changes"
-    if: build.pull_request.id != null
+    if: build.pull_request.id != null && build.env("GITHUB_PR_TRIGGER_COMMENT") != "/run exhaustive tests"
     plugins:
       - monorepo-diff#v1.0.1:
           diff: "git diff --name-only origin/${GITHUB_PR_TARGET_BRANCH}...HEAD"
@@ -16,19 +16,10 @@ steps:
                   commit: "${BUILDKITE_COMMIT}"
                   branch: "${BUILDKITE_BRANCH}"
                   env:
-                    - BUILDKITE_PULL_REQUEST=${BUILDKITE_PULL_REQUEST}
-                    - BUILDKITE_PULL_REQUEST_BASE_BRANCH=${BUILDKITE_PULL_REQUEST_BASE_BRANCH}
-                    - GITHUB_PR_LABELS=${GITHUB_PR_LABELS}
-                    - ELASTIC_SLACK_NOTIFICATIONS_ENABLE=false
+                    BUILDKITE_PULL_REQUEST="${BUILDKITE_PULL_REQUEST}"
+                    BUILDKITE_PULL_REQUEST_BASE_BRANCH="${BUILDKITE_PULL_REQUEST_BASE_BRANCH}"
+                    ELASTIC_SLACK_NOTIFICATIONS_ENABLE=false
 
   - label: "Trigger logstash-exhaustive-tests-pipeline for GitHub comments"
-    if: build.env("GITHUB_PR_TRIGGER_COMMENT") != ""
-    trigger: "logstash-exhaustive-tests-pipeline"
-    build:
-      commit: "${BUILDKITE_COMMIT}"
-      branch: "${BUILDKITE_BRANCH}"
-      env:
-        - BUILDKITE_PULL_REQUEST=${BUILDKITE_PULL_REQUEST}
-        - BUILDKITE_PULL_REQUEST_BASE_BRANCH=${BUILDKITE_PULL_REQUEST_BASE_BRANCH}
-        - GITHUB_PR_LABELS=${GITHUB_PR_LABELS}
-        - ELASTIC_SLACK_NOTIFICATIONS_ENABLE=false
+    if: build.env("GITHUB_PR_TRIGGER_COMMENT") == "/run exhaustive tests"
+    command: "buildkite-agent pipeline upload .buildkite/exhaustive_tests_pipeline.yml"

ci/acceptance_tests.sh

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 set -eo pipefail
 
+
 function get_package_type {
   # determines OS packaging system; at the moment either rpm or deb
   source /etc/os-release