FROM golang:1.22-alpine AS build

WORKDIR /build
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o shelly-exporter .

FROM alpine:3.20

RUN apk add --no-cache ca-certificates \
    && addgroup -S exporter \
    && adduser -S -G exporter exporter

WORKDIR /opt/shelly-exporter
COPY --from=build /build/shelly-exporter ./shelly-exporter
COPY config.example.yaml ./config.yaml

USER exporter
EXPOSE 9090
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s \
    CMD wget -q -O - http://127.0.0.1:9090/-/healthy || exit 1

ENTRYPOINT ["./shelly-exporter"]
CMD ["-config", "config.yaml"]