Introduce env variable on pipeline definition level

Author: CoenWarmer

.buildkite/pipeline-utils/pr_labels.ts

@@ -14,9 +14,6 @@ export const LABEL_MAPPING: Record<string, Record<string, string>> = {
   'ci:use-chrome-beta': {
     USE_CHROME_BETA: 'true', // Use if you want to run tests with Chrome Beta
   },
-  'ci:beta-faster-pr-build': {
-    KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build', // Tracks the optimized PR build pipeline
-  },
 };
 
 /**

.buildkite/scripts/pipelines/pull_request/pipeline.sh

@@ -2,7 +2,10 @@
 
 set -euo pipefail
 
+# Set environment variables based on PR labels for OTEL tracking
 if [[ "${GITHUB_PR_LABELS:-}" == *"ci:beta-faster-pr-build"* ]]; then
+  export KIBANA_CI_PIPELINE_TYPE="faster_pr_build"
+  
   # Quietly upload the cache-warmup step before everything else,
   # in order to run it sooner than others, and have a warm cache by the time other steps run.
   (buildkite-agent pipeline upload .buildkite/pipelines/pull_request/store_moon_cache.yml > /dev/null \

.buildkite/scripts/pipelines/pull_request/pipeline.ts

@@ -16,15 +16,13 @@
         ] */
 
 import fs from 'fs';
-import { dump } from 'js-yaml';
 import prConfigs from '../../../pull_requests.json';
 import { runPreBuild } from './pre_build';
 import {
   areChangesSkippable,
   doAnyChangesMatch,
   getAgentImageConfig,
   emitPipeline,
-  collectEnvFromLabels,
 } from '#pipeline-utils';
 
 const prConfig = prConfigs.jobs.find((job) => job.pipelineSlug === 'kibana-pull-request');
@@ -67,11 +65,6 @@ const getPipeline = (filename: string, removeSteps = true) => {
 
     if (GITHUB_PR_LABELS.includes('ci:beta-faster-pr-build')) {
       await runPreBuild();
-      // KIBANA_CI_PIPELINE_TYPE is auto-set from the label via LABEL_MAPPING
-      const envFromLabels = collectEnvFromLabels(GITHUB_PR_LABELS);
-      if (Object.keys(envFromLabels).length > 0) {
-        pipeline.push(dump({ env: envFromLabels }));
-      }
       pipeline.push(getPipeline('.buildkite/pipelines/pull_request/base_merged_phases.yml', false));
     } else {
       pipeline.push(getPipeline('.buildkite/pipelines/pull_request/base.yml', false));