add Dockerfile

Dockerfile

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+FROM golang:1.24.0-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o /app/manager ./cmd/manager
+
+FROM alpine:latest
+
+WORKDIR /root/
+
+COPY --from=builder /app/manager .
+
+EXPOSE 8080
+
+CMD ["./manager"]