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

learn/learn-kubernetes-master/kiamol/ch11/docker-images/jenkins/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 
+RUN ARCH2= && alpineArch="$(apk --print-arch)" \
+    && case "${alpineArch##*-}" in \
+    x86_64) ARCH2='amd64' ;; \
+    aarch64) ARCH2='arm64' ;; \
+    *) echo "unsupported architecture"; exit 1 ;; \
+    esac && \
+    echo $ARCH2 > /arch2.txt 
+
+FROM download-base AS packages
+ARG KUBECTL_VERSION="1.24.4-r0"
+RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing \
+    kubectl=$KUBECTL_VERSION
+
+FROM download-base AS buildkit
+ARG BUILDKIT_VERSION="v0.9.0"
+RUN wget -O buildkit.tar.gz "https://github.com/moby/buildkit/releases/download/$BUILDKIT_VERSION/buildkit-$BUILDKIT_VERSION.linux-$(cat /arch2.txt).tar.gz"
+RUN tar xvf buildkit.tar.gz
+
+FROM download-base AS helm
+ARG HELM_VERSION="v3.6.2"
+RUN wget -O helm.tar.gz "https://get.helm.sh/helm-$HELM_VERSION-linux-$(cat /arch2.txt).tar.gz"
+RUN tar xvf helm.tar.gz --strip-components 1
+
+FROM download-base AS jenkins
+ARG JENKINS_VERSION="2.319.1"
+RUN wget http://mirrors.jenkins.io/war-stable/$JENKINS_VERSION/jenkins.war
+
+# Jenkins
+FROM alpine:$ALPINE_VERSION
+
+# jenkins deps
+RUN apk add --no-cache \
+    bash \
+    coreutils \
+    jq \
+    git \
+    openjdk11 \
+    openssh-client \
+    ttf-dejavu \
+    unzip 
+
+ENV JENKINS_HOME="/data"
+VOLUME ${JENKINS_HOME}
+    
+EXPOSE 8080
+ENTRYPOINT /start.sh
+
+COPY --from=packages /usr/bin/kubectl /usr/bin/kubectl
+COPY --from=buildkit /downloads/bin/buildctl /usr/bin/buildctl
+COPY --from=helm /downloads/helm /usr/bin/helm
+COPY --from=jenkins /downloads/jenkins.war /jenkins/jenkins.war
+
+COPY ./jenkins.install.UpgradeWizard.state ${JENKINS_HOME}/
+COPY ./scripts/ ${JENKINS_HOME}/init.groovy.d/
+COPY start.sh /
+
+RUN chmod +x /start.sh