FROM golang:1.22 as build

# Copy project sources
COPY . /opt/project/
WORKDIR /opt/project

# Install Pre-Requisites
RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates=20230311
# Create a user
RUN useradd --no-create-home --system --shell /bin/false ddnsuser

RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /cloudflare-ddns-updater

FROM scratch
COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=build /cloudflare-ddns-updater /cloudflare-ddns-updater
COPY --from=build /bin/false /bin/false
COPY --from=build /etc/passwd /etc/passwd

USER nobody
ENTRYPOINT ["/cloudflare-ddns-updater"]