Initial commit — energy collector (AlphaEss + SDM630 → TimescaleDB)

Dockerfile

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+FROM golang:1.24-bookworm AS builder
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY *.go ./
+RUN CGO_ENABLED=0 go build -o energy-collector .
+
+FROM alpine:3.21
+RUN apk add --no-cache ca-certificates tzdata
+WORKDIR /app
+COPY --from=builder /app/energy-collector .
+USER nobody:nobody
+ENTRYPOINT ["./energy-collector", "-c", "/srv/energy/collector/config.json"]