ARG BUILDX_VERSION=0.11.2@sha256:e7f00cf9fc3754de699190b215d383e57bd654179b31b28eefadf978a362e647
ARG DOCKER_VERSION=20.10-dind@sha256:af96c680a7e1f853ebdd50c1e0577e5df4089b033102546dd6417419564df3b5
ARG GOLANG_VERSION=1.21@sha256:24a09375a6216764a3eda6a25490a88ac178b5fcb9511d59d0da5ebf9e496474

FROM --platform=$BUILDPLATFORM golang:${GOLANG_VERSION} as build

COPY . /src
WORKDIR /src

ARG TARGETOS TARGETARCH
RUN --mount=type=cache,target=/root/.cache/go-build \
    --mount=type=cache,target=/go/pkg \
    make build

FROM docker/buildx-bin:${BUILDX_VERSION} as buildx-bin
FROM docker:${DOCKER_VERSION}

RUN apk --update --no-cache add coredns

COPY --from=build /src/Corefile /etc/coredns/Corefile
COPY --from=buildx-bin /buildx /usr/libexec/docker/cli-plugins/docker-buildx
COPY --from=build /src/plugin-docker-buildx /bin/plugin-docker-buildx

ENV DOCKER_HOST=unix:///var/run/docker.sock

ENTRYPOINT ["/usr/local/bin/dockerd-entrypoint.sh", "plugin-docker-buildx"]