Migrates the Overleaf monorepo package manager from npm (v11) to Yarn 4 (v4.9.1) using node-modules linker mode.
GitOrigin-RevId: 50d32ab01955c15e29679eff9e9e9cfb897fab2d
* [monorepo] move building of nginx proxy into Makefile
* [v1] add fake-secrets.env
* [github] add copilot-setup-steps.yml workflow
* [make] debug permissions
* [monorepo] use the host uid/gid for monorepo service
* [web] populate DOCKER_USER for test_frontend_ct
* [github] run npm install outside docker in Copilot sandbox
* [monorepo] add comment for building nginx-proxy image locally
* [monorepo] change uid/gid of node user in cypress image
* [monorepo] low-level rewrite of passwd and groups to match host user
GitOrigin-RevId: d74a5801f0318bab7e7f460374255426706002a3
