docker build doesn't work

[nazar-pc]

It is a common sense that docker build must build an image, currently Dockerfile expects to have precompiled binary in .build instead.

I'm not working with Golang, I don't have toolchain installed and no idea how to use it. It'd be great if instead of copying supposedly existing files Dockerfile would actually build stuff.

UPD: This imperfect version worked for me:

FROM golang:1.19 AS build-stage

WORKDIR /app
COPY . /app

RUN CGO_ENABLED=0 GOOS=linux go build -o /smartctl_exporter

FROM alpine:3

RUN apk add smartmontools

COPY --from=build-stage /smartctl_exporter /bin/smartctl_exporter

EXPOSE      9633
USER        nobody
ENTRYPOINT  [ "/bin/smartctl_exporter" ]