FROM golang:1.26.1 as builder

WORKDIR /app

COPY go.mod go.sum ./
RUN --mount=type=cache,target=/go/pkg/mod \
  --mount=type=cache,target=/root/.cache/go-build \
  go mod download

COPY . .
ENV CGO_ENABLED=0
RUN --mount=type=cache,target=/go/pkg/mod \
  --mount=type=cache,target=/root/.cache/go-build \
  go build -ldflags "-s -w" -o agent ./cmd/main.go

FROM debian:bookworm-slim

RUN apt-get update && apt-get install -y --no-install-recommends \
  systemd \
  && rm -rf /var/lib/apt/lists/*

WORKDIR /app

COPY --from=builder /app/agent .

CMD ["./agent"]