base: avoid unnecessary env variables

dist/images/Dockerfile.base

@@ -95,20 +95,20 @@ RUN mkdir -p /var/run/openvswitch && \
     mkdir -p /etc/cni/net.d && \
     mkdir -p /opt/cni/bin
 
-ENV DUMB_INIT_VERSION="1.2.5"
+ARG DUMB_INIT_VERSION="1.2.5"
 RUN curl -sSf -L --retry 5 -o /usr/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v${DUMB_INIT_VERSION}/dumb-init_${DUMB_INIT_VERSION}_$(arch) && \
     chmod +x /usr/bin/dumb-init
 
 ARG ARCH
-ENV CNI_VERSION=v1.4.1
+ARG CNI_VERSION=v1.4.1
 RUN curl -sSf -L --retry 5 https://github.com/containernetworking/plugins/releases/download/${CNI_VERSION}/cni-plugins-linux-${ARCH}-${CNI_VERSION}.tgz | tar -xz -C . ./loopback ./portmap ./macvlan
 
-ENV KUBE_VERSION="v1.29.5"
+ARG KUBE_VERSION="v1.29.5"
 
 RUN curl -L https://dl.k8s.io/${KUBE_VERSION}/kubernetes-client-linux-${ARCH}.tar.gz | tar -xz -C . && cp ./kubernetes/client/bin/kubectl /usr/bin/kubectl \
  && chmod +x /usr/bin/kubectl && rm -rf ./kubernetes
 
-ENV BFDD_VERSION="v0.5.4"
+ARG BFDD_VERSION="v0.5.4"
 RUN curl -sSf -L --retry 3 -o /usr/local/bin/bfdd-control https://github.com/bobz965/bfd-binary-for-kube-ovn-cni/releases/download/${BFDD_VERSION}/bfdd-control && \
     curl -sSf -L --retry 3 -o /usr/local/bin/bfdd-beacon https://github.com/bobz965/bfd-binary-for-kube-ovn-cni/releases/download/${BFDD_VERSION}/bfdd-beacon && \
     chmod +x /usr/local/bin/bfdd-control /usr/local/bin/bfdd-beacon