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

learn/learn-kubernetes-master/kiamol/ch13/docker-images/elasticsearch/Dockerfile

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+ARG ALPINE_VERSION="3.15"
+
+FROM alpine:$ALPINE_VERSION AS download-base
+WORKDIR /downloads
+RUN echo "$(apk --print-arch)" > /arch.txt 
+
+FROM download-base AS installer
+ARG ES_VERSION="7.10.2"
+
+# find the downloads for previous versions here - https://www.elastic.co/downloads/past-releases#elasticsearch-oss-no-jdk
+# 7.10 is the latest version which is OSS, see - https://www.elastic.co/pricing/faq/licensing
+# there's no no-jdk version for arm64, so we download the JDK and strip it out
+
+#https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-7.10.2-linux-x86_64.tar.gz
+#https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-7.10.2-linux-aarch64.tar.gz
+
+RUN wget -O elasticsearch.tar.gz "https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-${ES_VERSION}-linux-$(cat /arch.txt).tar.gz" 
+
+RUN mkdir /elasticsearch && \
+    tar -xzf elasticsearch.tar.gz --strip-components=1 -C /elasticsearch && \
+    rm -rf /elasticsearch/jdk
+
+# Elasticsearch requires a JVM - this image provides a minimal JRE installation
+# see the product-JVM version matrix https://www.elastic.co/support/matrix#matrix_jvm
+FROM openjdk:11.0.11-jre-slim
+
+WORKDIR /usr/share/elasticsearch
+COPY --from=installer /elasticsearch .
+
+EXPOSE 9200 9300
+ENV ES_HOME="/usr/share/elasticsearch" \
+    ES_JAVA_OPTS="-Xms1024m -Xmx1024m"
+
+COPY elasticsearch.yml log4j2.properties ./config/
+
+RUN groupadd -g 1000 elasticsearch && \
+    adduser -uid 1000 -gid 1000 --home ${ES_HOME} elasticsearch && \
+    chmod 0775 ${ES_HOME} && \
+    chown -R 1000:0 ${ES_HOME}
+
+USER elasticsearch:root
+CMD ["/usr/share/elasticsearch/bin/elasticsearch"]