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Ethan
ca7f07142e
Adds a `flake-go` workflow that hunts for ordering-dependent and racy Go tests on pull requests. The workflow runs only on PRs (cancelling earlier runs on new commits) and skips test execution when no Go test files changed. A single `flake_go` job uses [coder/whichtests](https://github.com/coder/whichtests) with `--coalesce` to compute the directly-modified `Test*` functions from the PR diff and emit them as one target row. The same job then runs those selected tests on a deliberately resource-constrained 4-vCPU runner with 4x parallelism oversubscription, `-count=25`, and `-shuffle=on` to amplify contention and surface flakes. Pinned at [coder/whichtests@ec33bab](https://github.com/coder/whichtests/commit/ec33bab1ec04cd86beb7a61a069db4463dba63f5). Reuses the `test-go-pg` composite (with its new `run-regex`, `test-shuffle`, and `gotestsum-json-file` inputs) and the `go-test-failure-report` composite, both introduced on the base branch (#25670), so this workflow shares one implementation of the gotestsum + failure-report path with the existing CI jobs. `Makefile` adds `TEST_SHUFFLE` support and single-quotes `RUN` so whichtests' regex survives shell parsing. Stacked on top of #25670. Demo @ https://github.com/coder/coder/actions/runs/26494322649/job/78018779381?pr=25667 Closes CODAGT-381