Upgrade kubectx from v0.7.1 to v0.8.0.

Author: liqiang-fit2cloud

Dockerfile

@@ -23,7 +23,7 @@ COPY --from=gotty-build /gotty /usr/bin/
 RUN apt-get update && \
     apt-get install -y --no-install-recommends curl ca-certificates jq iproute2 less bash-completion unzip sysstat acl net-tools iputils-ping telnet dnsutils wget vim git && \
     curl -sLf https://storage.googleapis.com/kubernetes-release/release/${KUBECTL_VERSION}/bin/linux/${ARCH}/kubectl > /usr/bin/kubectl && chmod +x /usr/bin/kubectl && \
-    git clone --branch v0.7.1 https://github.com/ahmetb/kubectx /opt/kubectx && chmod -R 755 /opt/kubectx && ln -s /opt/kubectx/kubectx /usr/local/bin/kubectx && ln -s /opt/kubectx/kubens /usr/local/bin/kubens && \
+    git clone --branch v0.8.0 https://github.com/ahmetb/kubectx /opt/kubectx && chmod -R 755 /opt/kubectx && ln -s /opt/kubectx/kubectx /usr/local/bin/kubectx && ln -s /opt/kubectx/kubens /usr/local/bin/kubens && \
     git clone --branch master --depth 1 https://github.com/ahmetb/kubectl-aliases /opt/kubectl-aliases && chmod -R 755 /opt/kubectl-aliases && \
     git clone --branch 0.20.0 --depth 1 https://github.com/junegunn/fzf /opt/fzf && chmod -R 755 /opt/fzf && /opt/fzf/install && ln -s /opt/fzf/bin/fzf /usr/local/bin/fzf && \
     mkdir -p /tmp/k9s && cd /tmp/k9s && wget https://github.com/derailed/k9s/releases/download/v0.19.0/k9s_Linux_x86_64.tar.gz && tar -xvf k9s_Linux_x86_64.tar.gz && chmod +x k9s && mv k9s /usr/bin && \