Since T384927, the composer phpunit:prepare-parallel:extensions task that runs as part of CI jobs checks to see if the MW_RESULTS_CACHE_SERVER_BASE_URL environment variable is set to determine whether test timing information should be fetched from the phpunit results cache server. Since this variable is not currently set in CI, no attempt is made to use the timing information.

Set the MW_RESULTS_CACHE_SERVER_BASE_URL environment variable to 'https://phpunit-results-cache.toolforge.org/results' so that CI jobs can download and use timing information.

Acceptance Criteria

• The MW_RESULTS_CACHE_SERVER_BASE_URL environment variable is set in CI
• CI jobs are making use of the timing information