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Ethan
8b60d1d877
flake-go keeps failing every `TestServer` subtest that boots `coder server` with built-in PostgreSQL ([example run](https://github.com/coder/coder/actions/runs/28685288282/job/85134336803)) with `no version found matching 13.21.0`, which is embedded-postgres's error for any non-200 while downloading the Postgres binary archive from Maven. The archive gets cached under the server's config root, which is a fresh temp dir in every test, so with `test-count: 35` one flake run downloads it dozens of times and Maven rate-limits the runner. Using an external Postgres (like coder/terraform-provider-coderd#370 did) would defeat the point, since these subtests exist to exercise the built-in Postgres path. Instead, `startBuiltinPostgres` now honors `EMBEDDED_PG_CACHE_DIR` as the archive cache path (test runs only, data/runtime dirs stay per-test), and flake-go.yaml wires in the existing `embedded-pg-cache` actions the same way the Windows/macOS lanes in ci.yaml already do. All iterations then share a single download, and usually zero once the actions cache is warm. The upload step only saves on `main`.