# Build stage using an official Go image.
FROM golang:1.20 AS builder

WORKDIR /app

# Copy the source code and directories.
COPY . .

# Build the binary.
RUN CGO_ENABLED=0 go build -o dynamic_dns_server .

# Final minimal image.
FROM alpine:latest

WORKDIR /root/

# Copy the binary and the ssl & webroot directories.
COPY --from=builder /app/dynamic_dns_server .
COPY --from=builder /app/ssl ./ssl
COPY --from=builder /app/webroot ./webroot

# Expose the port (default 443).
EXPOSE 443

ENTRYPOINT ["./dynamic_dns_server"]