FROM golang:1.25.7-alpine3.22 AS build

COPY . /src

RUN cd /src \
    && go build -o dockerupdater \
    && mkdir -p ./fs/var/opt/dockerupdater \
    && mkdir -p ./fs/opt/dockerupdater \
    && cp dockerupdater ./fs/opt/dockerupdater/dockerupdater

FROM scratch AS prod

COPY --from=build --chmod=755 /src/fs /

ENTRYPOINT [ "/opt/dockerupdater/dockerupdater" ]