Buildkite introduction

[leo-ri]

first PR for starting work with Buildkite

[elasticmachine]

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• Start Time: 2023-11-20T10:54:56.585+0000

• Duration: 9 min 33 sec

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Test	Results
Failed	0
Passed	2858
Skipped	0
Total	2858

[dliappis]

This looks good, left a request for adding the ingest-end-prod-team and updating the RRE definition

[dliappis]

I actually had a discussion with the ci-systems team about this (because it's pinned to a specific version and doesn't include the latest information for RRE) and we should instead be using:

https://gist.githubusercontent.com/elasticmachine/988b80dae436cafea07d9a4a460a011d/raw/rre.schema.json

we should also raise PRs to fix old occurrences.

internal reference https://elasticco.atlassian.net/browse/CI-322?focusedCommentId=96184

[dliappis]

let's ensure that we always add the platform ingest eng prod team too like https://github.com/elastic/logstash/blob/8fa3bd0d7f4eed8f808120706a0f74ec5c1847a7/catalog-info.yaml#L265-L266

[dliappis]

LGTM