Dockerfile I use in Go projects

Dockerfile

FROM golang:1.18.4-alpine3.16 AS builder

ARG pkey
ENV SSH_PRIVATE_KEY $pkey

WORKDIR /service

ADD . .

RUN apk add --no-cache git openssh \
    && eval "$(ssh-agent)" \
    && echo "${SSH_PRIVATE_KEY}" | ssh-add - \
    && mkdir /root/.ssh \
    && ssh-keyscan -H gitlab.url > /root/.ssh/known_hosts \
    && git config --global url."git@gitlab.url:".insteadOf "https://gitlab.url/" \
    && go env -w GOPRIVATE="gitlab.url/orgname/*" \
    && CGO_ENABLED=0 GOOS=linux go build -a -o built_executable .

FROM scratch

WORKDIR /service

COPY --from=builder /service/built_executable ./

CMD [ "./built_executable" ]

echo "${SSH_PRIVATE_KEY}" is not a good idea, should be changed.