remove committed .index.mf and add to .gitignore

.index.mf is a generated manifest file that should not be tracked in
version control. Remove it from the repo and add it to .gitignore to
prevent accidental re-commits.

.gitignore

@@ -6,5 +6,8 @@
 vendor.tzst
 modcache.tzst
 
+# Generated manifest files
+.index.mf
+
 # Stale files
 .drone.yml

Dockerfile

@@ -1,9 +1,36 @@
-FROM golang@sha256:60deed95d3888cc5e4d9ff8a10c54e5edc008c6ae3fba6187be6fb592e19e8c0 AS builder
+# Lint stage — fast feedback on formatting and lint issues
+# golangci/golangci-lint:v2.0.2 (2026-03-14)
+FROM golangci/golangci-lint@sha256:d55581f7797e7a0877a7c3aaa399b01bdc57d2874d6412601a046cc4062cb62e AS lint
+
 WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download
+
 COPY . .
-RUN go test -v --timeout 30s ./...
+
+# Touch .pb.go so make does not try to regenerate via protoc (file is committed)
+RUN touch mfer/mf.pb.go
+
+RUN make fmt-check
+RUN make lint
+
+# Build stage — tests and compilation
+# golang:1.23 (2026-03-14)
+FROM golang@sha256:60deed95d3888cc5e4d9ff8a10c54e5edc008c6ae3fba6187be6fb592e19e8c0 AS builder
+
+# Force BuildKit to run the lint stage by creating a stage dependency
+COPY --from=lint /src/go.sum /dev/null
+
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+# Touch .pb.go so make does not try to regenerate via protoc (file is committed)
+RUN touch mfer/mf.pb.go
+
+RUN make test
 RUN cd cmd/mfer && go build -tags urfave_cli_no_docs -o /mfer .
 
 FROM scratch

Makefile

@@ -5,7 +5,7 @@ export PATH := $(PATH):$(GOPATH)/bin
 PROTOC_GEN_GO := $(GOPATH)/bin/protoc-gen-go
 SOURCEFILES := mfer/*.go mfer/*.proto internal/*/*.go cmd/*/*.go go.mod go.sum
 ARCH := $(shell uname -m)
-GITREV_BUILD := $(shell bash $(PWD)/bin/gitrev.sh)
+GITREV_BUILD := $(shell bash $(PWD)/bin/gitrev.sh 2>/dev/null || echo unknown)
 APPNAME := mfer
 VERSION := 0.1.0
 export DOCKER_IMAGE_CACHE_DIR := $(HOME)/Library/Caches/Docker/$(APPNAME)-$(ARCH)
@@ -13,7 +13,7 @@ GOLDFLAGS += -X main.Version=$(VERSION)
 GOLDFLAGS += -X main.Gitrev=$(GITREV_BUILD)
 GOFLAGS := -ldflags "$(GOLDFLAGS)"
 
-.PHONY: docker default run ci test fixme
+.PHONY: docker default run ci test check lint fmt fmt-check hooks fixme
 
 default: fmt test
 
@@ -32,8 +32,17 @@ $(PROTOC_GEN_GO):
 fixme:
 	@grep -nir fixme . | grep -v Makefile
 
+check: test lint fmt-check
+
+fmt-check: mfer/mf.pb.go
+	sh -c 'test -z "$$(gofmt -l .)"'
+
+hooks:
+	echo '#!/bin/sh\nmake check' > .git/hooks/pre-commit
+	chmod +x .git/hooks/pre-commit
+
 devprereqs:
-	which golangci-lint || go install -v github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+	which golangci-lint || go install -v github.com/golangci/golangci-lint/cmd/golangci-lint@v2.0.2
 
 mfer/mf.pb.go: mfer/mf.proto
 	cd mfer && go generate .