add Dockerfile for multi-stage build and update generate.go command

Dockerfile

@@ -0,0 +1,30 @@
+# ---------- Build Stage ----------
+FROM golang:1.24 AS builder
+
+# Set working directory
+WORKDIR /app
+
+# Copy Go module files and download dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the Go binary
+RUN CGO_ENABLED=0 GOOS=linux go build -o main ./cmd/api/main.go
+
+# ---------- Final Image ----------
+FROM alpine:latest
+
+# Set working directory in final image
+WORKDIR /app
+
+# Copy only the binary from builder
+COPY --from=builder /app/main .
+
+# Expose the port your app listens on
+EXPOSE 8080
+
+# Set default command
+CMD ["./main"]