[wp-trac] [WordPress Trac] #57687: Add automated performance testing CI workflow MVP

[WordPress Trac]

#57687: Add automated performance testing CI workflow MVP
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 Reporter:  adamsilverstein   |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:  trunk
 Severity:  normal            |   Keywords:  needs-patch
  Focuses:  performance       |
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 This ticket is a follow up to my make core blog post
 “[https://make.wordpress.org/core/2023/02/02/automated-performance-
 monitoring-in-wordpress-core/ Automated performance monitoring in
 WordPress core]” where we will work on and discuss the exact technical
 implementation of this feature.

 === Technical requirements
 As outlined in the blog post, the goals of the initial implementation will
 be limited so we can land a first stable version quickly, then we can
 iterate on the approach and exact metrics we collect over time.

 The initial implementation should satisfy these requirements:
 * Runs on each commit to trunk.
 * Uses the standard wp-env environment, taking measurements from Twenty
 Twenty One (classic) and Twenty Twenty Three (block) theme home pages
 using the [https://github.com/WPTT/theme-test-data theme test data].
 * Records median values over 10 runs for the following metrics using the
 Server-Timing API: total WordPress load time, time the template takes to
 load, and time that WordPress initialization takes before the template.
 * Sends the recorded values to a new core performance dashboard which will
 sit alongside the existing Gutenberg dashboard.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57687>
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