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docker/Dockerfile

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+# Build stage
+FROM golang:1.24-alpine AS builder
+
+WORKDIR /app
+
+# Copy dependency files first for layer caching
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source
+COPY . .
+
+# Build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o /gateway ./main.go
+
+# ─────────────────────────────────────────────
+# Runtime stage
+FROM alpine:3.21
+
+RUN apk --no-cache add ca-certificates tzdata
+
+WORKDIR /app
+
+# Copy binary and swagger docs
+COPY --from=builder /gateway .
+COPY --from=builder /app/docs ./docs
+
+# Non-root user for security
+RUN addgroup -S gateway && adduser -S gateway -G gateway
+USER gateway
+
+EXPOSE 8000
+
+ENTRYPOINT ["/app/gateway"]