Install testkube cli + completion

[gberche-orange]

Expected

As a paas-templates author, and operator In order to work with automated tests I need the testkube cli to be installed

https://docs.testkube.io/getting-started/step1-installing-cli#ubuntudebian

Current workaround

sudo -i
export no_proxy=127.0.0.1,localhost,....
export https_proxy=http://system-internet-http-proxy.internal.paas:3128
export HTTPS_PROXY=http://system-internet-http-proxy.internal.paas:3128
export HTTP_PROXY=http://system-internet-http-proxy.internal.paas:3128
export http_proxy=http://system-internet-http-proxy.internal.paas:3128
curl -sSLf https://get.testkube.io | bash

source <(kubectl testkube completion bash)

[ogrand]

Done with latest release