新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch12/docker-images/amd64.yml

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+version: "3.7"
+
+services:  
+  ch12-memory-allocator:
+    image: kiamol/ch12-memory-allocator:latest-linux-amd64

learn/learn-kubernetes-master/kiamol/ch12/docker-images/arm64.yml

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+version: "3.7"
+
+services:  
+  ch12-memory-allocator:
+    image: kiamol/ch12-memory-allocator:latest-linux-arm64

learn/learn-kubernetes-master/kiamol/ch12/docker-images/docker-compose.yml

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+version: "3.7"
+
+services:  
+  ch12-memory-allocator:
+    image: kiamol/ch12-memory-allocator:latest
+    build:
+      context: ./memory-allocator

learn/learn-kubernetes-master/kiamol/ch12/docker-images/memory-allocator/Dockerfile

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+FROM golang:1.15-alpine AS builder
+ENV CGO_ENABLED=0
+
+WORKDIR /src
+COPY ./src/go.mod .
+RUN go mod download
+
+COPY ./src/main.go .
+RUN go build -o /server
+
+# app
+FROM alpine:3.15
+
+EXPOSE 80
+CMD ["/app/server"]
+
+WORKDIR /app
+COPY ./src/config.toml .
+COPY --from=builder /server .

learn/learn-kubernetes-master/kiamol/ch12/docker-images/memory-allocator/src/config.toml

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+interval = 5
+allocation = 10

learn/learn-kubernetes-master/kiamol/ch12/docker-images/memory-allocator/src/go.mod

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+module kiamol/memory-allocator
+
+go 1.15
+
+require (
+    github.com/spf13/viper v1.10.1
+)

learn/learn-kubernetes-master/kiamol/ch12/docker-images/memory-allocator/src/main.go

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+package main
+
+import (
+    "fmt"
+    "time"
+	"github.com/spf13/viper"
+)
+
+type Configuration struct {
+	Interval int
+	Allocation int
+}
+
+func getConfig() Configuration {
+	viper.SetEnvPrefix("KIAMOL")
+	viper.AutomaticEnv()	
+	viper.SetConfigFile("./config.toml")
+	viper.ReadInConfig()
+	config := Configuration{}	
+    viper.Unmarshal(&config)    
+	return config
+}
+
+// adapted from:
+// https://golangcode.com/print-the-current-memory-usage/
+
+func main() {
+
+    config := getConfig()
+
+    var overall [][]int
+    //4.2M ints is about 1MB physical allocation:
+    length := config.Allocation * 4200000
+    count := 1
+
+    for {
+        // Allocate memory using make() and append to overall (so it doesn't get 
+        // garbage collected). This is to create an ever increasing memory usage 
+        // which we can track. We're just using []int as an example.
+        a := make([]int, 0, length)
+        overall = append(overall, a)
+
+        fmt.Printf("Allocated ~%vMiB\n", count * config.Allocation)
+        time.Sleep(time.Duration(config.Interval) * time.Second)
+        count++
+    }
+}

learn/learn-kubernetes-master/kiamol/ch12/docker-images/push-manifests.ps1

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+$images=$(yq e '.services.[].image' docker-compose.yml)
+
+foreach ($image in $images)
+{    
+    docker manifest create --amend $image `
+      "$($image)-linux-arm64" `
+      "$($image)-linux-amd64"
+    
+    docker manifest push $image
+}