Summary

Following up from PLANET-7211, this is for deploying the PHP upgrade in the production cluster.

Requirements

• Create a 7.4 branch out of main in the planet4-docker repo, in case we need to revert a certain website.
• Merge planet4-docker php8.1 branch into main.
• Create follow up tickets for next steps

After upgrade

• Update wp-stateless to 3.3.0
  • set google lib to match stateless: google/auth 1.28, google/apiclient 2.15
  • don't forget the package declared in master-theme, plan its removal either in base or master-theme
• Fix psr/log to 1.*
  • wp-stateless, cloudflare, wp-sentry include this version (vendor dir included); but google-api-client includes monolog, which can include a different psr/log version
• Remove PHP7.4 tests
• Add PHP8.2 tests (non blocking)
• Plan a migration to Timber 2
  • Timber 1 has unresolved deprecated messages
• Cf. https://github.com/greenpeace/planet4-base/compare/update/post-php8?expand=1