Add Dockerfile and Makefile for building and generating Protobuf code

Makefile

@@ -0,0 +1,14 @@
+PROTOC_GEN_GO := protoc-gen-go
+PROTOC_GEN_GO_GRPC := protoc-gen-go-grpc
+PROTO_DIR := pkg/pb
+PROTO_FILE := $(PROTO_DIR)/data_service/data.proto
+OUT_DIR := $(PROTO_DIR)
+
+.PHONY: proto
+proto:
+	@echo "Generating Go code from Protobuf..."
+	protoc \
+		--go_out=$(OUT_DIR) --go_opt=paths=source_relative \
+		--go-grpc_out=$(OUT_DIR) --go-grpc_opt=paths=source_relative \
+		$(PROTO_FILE)
+	@echo "Protobuf generation complete."

services/data_service/Dockerfile

@@ -0,0 +1,25 @@
+# Stage 1: Builder
+FROM golang:latest AS builder
+
+WORKDIR /app
+
+# Copy go mod and download deps
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source
+COPY . .
+
+# Build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -o /data_service ./services/data_service/cmd
+
+# Stage 2: Runner
+FROM debian:bullseye-slim
+
+# Minimal setup
+RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*
+
+# Copy binary
+COPY --from=builder /data_service /usr/local/bin/data_service
+
+ENTRYPOINT ["data_service"]