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+FROM golang:1.19-buster as builder
+
+# Create and change to the app directory.
+WORKDIR /app
+
+# Retrieve application dependencies.
+# This allows the container build to reuse cached dependencies.
+# Expecting to copy go.mod and if present go.sum.
+COPY go.* ./
+RUN go mod download
+
+# Copy local code to the container image.
+COPY . ./
+
+# Build the binary.
+RUN go build -v -o etl ./cmd/etl/main.go
+
+# Use the official Debian slim image for a lean production container.
+FROM debian:buster-slim
+RUN set -x && apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    ca-certificates && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy the binary to the production image from the builder stage.
+COPY --from=builder /app/etl /app/etl
+
+# Run the web service on container startup.
+CMD ["/app/etl"]