[9.2] [CI] Use alternative place to inject env variable (#243371) (#244085)

# Backport

This will backport the following commits from `main` to `9.2`:
- [[CI] Use alternative place to inject env variable
(#243371)](#243371)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Coen
Warmer","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-11-25T06:35:49Z","message":"[CI]
Use alternative place to inject env variable (#243371)\n\n##
Summary\n\nWe introduced adding an env variable in
[this\nPR](#243191) that allows us
to\ndifferentiate CI runs with the new pipeline configuration from the
old\none.\n\nAdding an env variable on the pipeline level is not
possible as
the\n[kibana-pr.yml](https://github.com/elastic/kibana/blob/main/.buildkite/pipeline-resource-definitions/kibana-pr.yml)\nis
defined statically in yml, and the new pipeline config is the result\nof
a Github tag.\n\nThis PR instead adds the env variable to all jobs that
are part of the\nnew config, which we know do get shipped to the
Buildkite Stats cluster.\n\nI am not aware of a way to add the env
variable on the pipeline\ndefinition yaml. If this is possible, please
let me know and
I'll\nupdate.","sha":"f8c2301811934e90f9bc50271dd171e6b678521a","branchLabelMapping":{"^v9.3.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v8.16.0","backport:version","v9.2.0","v9.3.0","ci:beta-faster-pr-build"],"title":"[CI]
Use alternative place to inject env
variable","number":243371,"url":"https://github.com/elastic/kibana/pull/243371","mergeCommit":{"message":"[CI]
Use alternative place to inject env variable (#243371)\n\n##
Summary\n\nWe introduced adding an env variable in
[this\nPR](#243191) that allows us
to\ndifferentiate CI runs with the new pipeline configuration from the
old\none.\n\nAdding an env variable on the pipeline level is not
possible as
the\n[kibana-pr.yml](https://github.com/elastic/kibana/blob/main/.buildkite/pipeline-resource-definitions/kibana-pr.yml)\nis
defined statically in yml, and the new pipeline config is the result\nof
a Github tag.\n\nThis PR instead adds the env variable to all jobs that
are part of the\nnew config, which we know do get shipped to the
Buildkite Stats cluster.\n\nI am not aware of a way to add the env
variable on the pipeline\ndefinition yaml. If this is possible, please
let me know and
I'll\nupdate.","sha":"f8c2301811934e90f9bc50271dd171e6b678521a"}},"sourceBranch":"main","suggestedTargetBranches":["8.16","9.2"],"targetPullRequestStates":[{"branch":"8.16","label":"v8.16.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"9.2","label":"v9.2.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v9.3.0","branchLabelMappingKey":"^v9.3.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/243371","number":243371,"mergeCommit":{"message":"[CI]
Use alternative place to inject env variable (#243371)\n\n##
Summary\n\nWe introduced adding an env variable in
[this\nPR](#243191) that allows us
to\ndifferentiate CI runs with the new pipeline configuration from the
old\none.\n\nAdding an env variable on the pipeline level is not
possible as
the\n[kibana-pr.yml](https://github.com/elastic/kibana/blob/main/.buildkite/pipeline-resource-definitions/kibana-pr.yml)\nis
defined statically in yml, and the new pipeline config is the result\nof
a Github tag.\n\nThis PR instead adds the env variable to all jobs that
are part of the\nnew config, which we know do get shipped to the
Buildkite Stats cluster.\n\nI am not aware of a way to add the env
variable on the pipeline\ndefinition yaml. If this is possible, please
let me know and
I'll\nupdate.","sha":"f8c2301811934e90f9bc50271dd171e6b678521a"}}]}]
BACKPORT-->

Co-authored-by: Coen Warmer <[email protected]>

Author: kibanamachine

.buildkite/pipelines/pull_request/base_merged_phases.yml

@@ -1,6 +1,3 @@
-env:
-  KIBANA_CI_MERGED_PHASES: 'true'
-
 steps:
   - command: .buildkite/scripts/steps/build_kibana.sh
     label: Build Kibana Distribution
@@ -10,6 +7,8 @@ steps:
     key: build
     if: "build.env('KIBANA_BUILD_ID') == null || build.env('KIBANA_BUILD_ID') == ''"
     timeout_in_minutes: 90
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '-1'
@@ -23,6 +22,8 @@ steps:
       diskSizeGb: 115
     key: quick_checks
     timeout_in_minutes: 60
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '-1'
@@ -36,6 +37,8 @@ steps:
       preemptible: true
       diskSizeGb: 115
     timeout_in_minutes: 60
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '-1'
@@ -49,6 +52,8 @@ steps:
       diskSizeGb: 115
     key: linting
     timeout_in_minutes: 60
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '-1'
@@ -62,6 +67,8 @@ steps:
       diskSizeGb: 115
     key: linting_with_types
     timeout_in_minutes: 60
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '-1'
@@ -74,6 +81,8 @@ steps:
       preemptible: true
     key: check_oas_snapshot
     timeout_in_minutes: 60
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '-1'
@@ -89,6 +98,8 @@ steps:
       diskSizeGb: 115
     key: check_types
     timeout_in_minutes: 60
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '-1'
@@ -106,6 +117,7 @@ steps:
       JEST_CONFIGS_DEPS: 'check_types'
       FTR_CONFIGS_SCRIPT: '.buildkite/scripts/steps/test/ftr_configs.sh'
       FTR_CONFIGS_DEPS: 'build,check_types'
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '*'
@@ -117,6 +129,8 @@ steps:
       machineType: n2-standard-2
       diskSizeGb: 115
     timeout_in_minutes: 10
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     depends_on:
       - build
       - build_api_docs
@@ -140,6 +154,8 @@ steps:
       - quick_checks
       - check_oas_snapshot
     timeout_in_minutes: 90
+    env:
+      KIBANA_CI_PIPELINE_TYPE: 'faster_pr_build'
     retry:
       automatic:
         - exit_status: '-1'