[8.x] [ci] Set disk size for artifact builds (#197663) (#201893)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[ci] Set disk size for artifact builds
(#197663)](#197663)

<!--- Backport version: 9.4.3 -->

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

<!--BACKPORT
[{"author":{"name":"Jon","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-11-26T23:35:57Z","message":"[ci]
Set disk size for artifact builds (#197663)\n\nDefines disk size for
artifact builds. This will be a no-op - the boot\r\ndisk size is >= the
definitions in this PR.\r\n\r\nA test run with the smaller boot disk can
be seen
in\r\nhttps://buildkite.com/elastic/kibana-pull-request/builds/248242. I
plan\r\non making further adjustments after the boot disk has been
promoted.","sha":"316efc71d67ed565b7b6aad2947cb380ac39db1b","branchLabelMapping":{"^v9.0.0$":"main","^v8.18.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Operations","release_note:skip","v9.0.0","backport:all-open"],"title":"[ci]
Set disk size for artifact
builds","number":197663,"url":"https://github.com/elastic/kibana/pull/197663","mergeCommit":{"message":"[ci]
Set disk size for artifact builds (#197663)\n\nDefines disk size for
artifact builds. This will be a no-op - the boot\r\ndisk size is >= the
definitions in this PR.\r\n\r\nA test run with the smaller boot disk can
be seen
in\r\nhttps://buildkite.com/elastic/kibana-pull-request/builds/248242. I
plan\r\non making further adjustments after the boot disk has been
promoted.","sha":"316efc71d67ed565b7b6aad2947cb380ac39db1b"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.0.0","branchLabelMappingKey":"^v9.0.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/197663","number":197663,"mergeCommit":{"message":"[ci]
Set disk size for artifact builds (#197663)\n\nDefines disk size for
artifact builds. This will be a no-op - the boot\r\ndisk size is >= the
definitions in this PR.\r\n\r\nA test run with the smaller boot disk can
be seen
in\r\nhttps://buildkite.com/elastic/kibana-pull-request/builds/248242. I
plan\r\non making further adjustments after the boot disk has been
promoted.","sha":"316efc71d67ed565b7b6aad2947cb380ac39db1b"}}]}]
BACKPORT-->

Co-authored-by: Jon <[email protected]>

.buildkite/pipelines/artifacts.yml

@@ -6,6 +6,7 @@ steps:
       imageProject: elastic-images-prod
       provider: gcp
       machineType: c2-standard-16
+      diskSizeGb: 125
     timeout_in_minutes: 120
     retry:
       automatic:

.buildkite/pipelines/pull_request/base.yml

@@ -12,6 +12,7 @@ steps:
     agents:
       machineType: n2-standard-8
       preemptible: true
+      diskSizeGb: 125
     key: build
     if: "build.env('KIBANA_BUILD_ID') == null || build.env('KIBANA_BUILD_ID') == ''"
     timeout_in_minutes: 90