clawbot 2f15340f26 Split Dockerfile: pre-built golangci-lint stage for faster CI (#23) ...

## Summary

Splits the Dockerfile into a dedicated lint stage using the pre-built `golangci/golangci-lint:v2.10.1-alpine` Docker image, replacing the manual binary download with curl/sha256 verification.

## Changes

- **Lint stage** (`AS lint`): Uses `golangci/golangci-lint:v2.10.1-alpine` pinned by sha256. Runs `make fmt-check` + `make lint`. Includes CGO deps (`build-base`, `vips-dev`, `libheif-dev`, `pkgconfig`) needed for type-checking govips imports.
- **Build stage** (`AS builder`): Depends on lint stage via `COPY --from=lint /src/go.sum /dev/null`. Runs `make test` + builds the binary. Removes `curl` (no longer needed) and the manual golangci-lint download block.
- **Runtime stage**: Unchanged.

## Benefits

- Eliminates slow multi-arch binary download + sha256 verification step
- Lint and build stages can potentially run in parallel with BuildKit
- Better Docker layer caching — lint deps cached separately from build deps
- All images remain pinned by sha256 with version+date comments

## Verification

- `docker build .` passes: fmt-check ✅, lint (0 issues) ✅, all tests pass ✅, binary builds ✅

Closes [#18](#18)

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Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de>
Reviewed-on: #23
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>

2026-03-02 21:09:51 +01:00

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