feat: Add Dockerfile for CLI component

- Create multi-stage Dockerfile for CLI application
- Use golang:1.26-alpine as builder image
- Copy go.mod and go.sum for dependency caching
- Build static binary with CGO_ENABLED=0
- Use alpine:latest as runtime image with ca-certificates
- Set /root/ as working directory and ./cli as default command

deployments/docker/cli.Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:1.26-alpine AS builder
+
+WORKDIR /app
+
+COPY apps/cli/go.mod apps/cli/go.sum ./
+RUN go mod download
+
+COPY apps/cli/ ./
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o cli .
+
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+COPY --from=builder /app/cli .
+
+CMD ["./cli"]