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+# ------------------------------------------------------------
+# 1. Build stage
+# ------------------------------------------------------------
+FROM golang:1.22-alpine AS builder
+
+# Install build tools
+RUN apk add --no-cache git
+
+WORKDIR /app
+
+# Download dependencies first (better caching)
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source
+COPY . .
+
+# Build statically for small final image
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o server .
+
+# ------------------------------------------------------------
+# 2. Final minimal image
+# ------------------------------------------------------------
+FROM alpine:3.20
+
+# Add non-root user for security
+RUN adduser -D -g '' appuser
+
+WORKDIR /app
+
+# Copy compiled binary
+COPY --from=builder /app/server .
+
+# Expose Gin port (change if your app uses another)
+EXPOSE 8080
+
+USER appuser
+
+CMD ["./server"]