Split Dockerfile: pre-built golangci-lint stage for faster CI (#45)
Closes #39 Splits the Dockerfile into a dedicated lint stage using the `golangci/golangci-lint` image directly, rather than copying the binary into the builder stage. ## Changes ### Dockerfile - **Lint stage** (`AS lint`): Uses the pre-built `golangci/golangci-lint` image (pinned by sha256) to run `make fmt-check` and `make lint`. This is a self-contained stage with its own `go mod download` and source copy. - **Builder stage** (`AS builder`): Runs only `make test` and the final binary build. No longer needs golangci-lint installed. - **Stage dependency**: `COPY --from=lint /src/go.sum /dev/null` forces BuildKit to always execute the lint stage (without this, unused stages are silently skipped). - Both stages touch `mfer/mf.pb.go` to prevent make from trying to regenerate via protoc. With BuildKit, the lint and builder stages run in parallel after their shared `go mod download` layers complete, so lint/formatting failures surface much faster without blocking on test execution. ### Makefile - Added `lint` to the `check` target prereqs: `check: test lint fmt-check` (was `check: test fmt-check`), matching the [REPO_POLICIES](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/REPO_POLICIES.md) requirement. Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de> Reviewed-on: #45 Co-authored-by: clawbot <clawbot@noreply.example.org> Co-committed-by: clawbot <clawbot@noreply.example.org>
This commit was merged in pull request #45.
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