* [monorepo] avoid corepack network requests
- Download yarn via corepack as the first step in all the docker files
- Turn off networking in corepack
- Do not run things in the upstream node image
Instead, use the monorepo image, or base layer in all the services.
- Always build the base layer when running tests (uses cache)
* [monorepo] install corepack in shared place
* [clsi-lb] remove unrelated changes
* [web] add missing DC_RUN_FLAGS
* [monorepo] only rebuild test images locally
Also remove spurious build config in docker-compose.ci.yml.
* [server-ce] test: make yarn files available to host-admin and e2e
* [monorepo] put the corepack install snippet in a few more places
GitOrigin-RevId: 38005016ae5a708e12295e246269d6c18fece937
