opentofu creating docker image and compiling linux binary

Dockerfile

ARG GO_VERSION=1.20

FROM golang:${GO_VERSION}-bookworm as builder
WORKDIR /app
RUN git clone --depth 1 https://github.com/opentofu/opentofu.git .
RUN go mod download && go mod verify
RUN CGO_ENABLED=0 GOOS=linux go build -v -o bin/ ./cmd/tofu

FROM scratch AS export-stage
COPY --from=builder /app/bin/tofu /

FROM ubuntu:jammy as release
WORKDIR /usr/local/bin
COPY --from=builder /app/bin/tofu ./
CMD [ "tofu" ]

Makefile

BUILD_CMD ?= docker build
DESTDIR ?= ./bin
NAME ?= shvargon/opentofu

all: build binary

.PHONY: build
build:
	$(BUILD_CMD) -t "$(NAME)" .
          
.PHONY: binary
binary:
	$(BUILD_CMD) -o "$(DESTDIR)" . --target=export-stage