update demo docker compose project

test/Dockerfile

@@ -0,0 +1,3 @@
+FROM alpine:latest
+
+COPY . /app

test/docker-compose.yml

@@ -0,0 +1,25 @@
+version: "3.5"
+services:
+  my-service:
+    build:
+      dockerfile: Dockerfile
+      context: .
+    command: /app/print-random-stuff.sh
+    depends_on:
+      - my-service2
+    ports:
+      - 123:321
+
+  my-service2:
+    build:
+      dockerfile: Dockerfile
+      context: .
+    command: /app/print-random-stuff.sh
+    ports:
+      - 12345:12345
+
+  my-service3:
+    build:
+      dockerfile: Dockerfile
+      context: .
+    command: /app/print-random-stuff.sh

test/print-random-stuff.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+while true
+do
+  echo $((1 + $RANDOM % 10))
+  sleep 1
+done

test/printrandom/Dockerfile

@@ -1,24 +0,0 @@
-# building the binary
-FROM golang:1.11 as builder
-
-# Add Maintainer Info
-LABEL maintainer="Jesse Duffield <jessedduffield@gmail.com>"
-
-# Set the Current Working Directory inside the container
-WORKDIR /src/github.com/jesseduffield/lazydocker/test/printrandom
-
-# Copy everything from the current directory to the PWD(Present Working Directory) inside the container
-COPY . .
-
-# Build the package
-RUN go build
-
-# putting binary into a minimal image
-FROM scratch
-
-WORKDIR /root/
-
-COPY --from=builder /src/github.com/jesseduffield/lazydocker/test/printrandom/printrandom .
-
-# Run the executable
-CMD ["./printrandom"]

test/printrandom/main.go

@@ -1,26 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"math/rand"
-	"os"
-	"os/signal"
-	"time"
-)
-
-func main() {
-	exitOnInterrupt()
-
-	for range time.Tick(time.Second / 3) {
-		fmt.Println(rand.Intn(1000))
-	}
-}
-
-func exitOnInterrupt() {
-	c := make(chan os.Signal, 1)
-	signal.Notify(c, os.Interrupt)
-	go func() {
-		<-c
-		os.Exit(0)
-	}()
-}