Second checkpoint

build/package/Dockerfile

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+# Build context is the repo root: docker build -f build/package/Dockerfile .
+FROM golang:1.26.1-alpine AS builder
+
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -o /out/gis ./cmd/gis
+
+FROM alpine:3.20
+
+# gdal-tools provides gdal_translate / gdalinfo for raster COG conversion (worker).
+RUN apk add --no-cache ca-certificates tzdata gdal-tools \
+    && adduser -D -u 10001 app
+
+WORKDIR /app
+COPY --from=builder /out/gis /usr/local/bin/gis
+
+USER app
+
+EXPOSE 8080
+
+ENTRYPOINT ["gis"]
+CMD ["serve"]