# syntax=docker/dockerfile:1.7
FROM golang:1.25.12-alpine AS build

RUN apk add --no-cache build-base
WORKDIR /src

COPY go.mod go.sum ./
RUN go mod download

COPY . .
RUN CGO_ENABLED=1 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/dyndns-web ./cmd/dyndns-web

FROM alpine:3.23.2 AS runtime

RUN apk add --no-cache ca-certificates && \
    addgroup -S -g 10001 dyndns && \
    adduser -S -D -H -u 10001 -G dyndns dyndns && \
    mkdir -p /data && chown dyndns:dyndns /data

COPY --from=build /out/dyndns-web /usr/local/bin/dyndns-web

USER dyndns:dyndns
WORKDIR /data
EXPOSE 8080

HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 CMD ["/usr/local/bin/dyndns-web", "healthcheck"]

ENTRYPOINT ["/usr/local/bin/dyndns-web"]