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

learn/learn-kubernetes-master/kiamol/ch17/docker-images/todo-list-configurator/Dockerfile

@@ -0,0 +1,10 @@
+ARG ALPINE_VERSION="3.15"    
+FROM alpine:$ALPINE_VERSION
+
+RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing kubectl
+
+COPY start.sh /
+COPY config.json /config-in/config.json
+RUN chmod +x /start.sh
+
+CMD /start.sh

learn/learn-kubernetes-master/kiamol/ch17/docker-images/todo-list-configurator/config.json

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+{
+    "BannerMessage": "{LABEL}"
+}

learn/learn-kubernetes-master/kiamol/ch17/docker-images/todo-list-configurator/start.sh

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+#!/bin/sh
+
+# set up access to Kube API
+kubectl config set-cluster default --server=https://kubernetes.default.svc.cluster.local --certificate-authority=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
+kubectl config set-context default --cluster=default
+kubectl config set-credentials user --token=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)
+kubectl config set-context default --user=user
+kubectl config use-context default
+
+label=$(kubectl get ns kiamol-ch17 -o jsonpath='{.metadata.labels.kiamol}')
+sed -i "s/{LABEL}/$label/g" /config-in/config.json
+cp /config-in/config.json /config-out/config.json
+
+echo "** Namespace label: $label. Written to config file **"