Updated wiki page

Hello together, as announced in our last training session, I have updated our wiki page: https://en.opensuse.org/ZSystems Everybody, who hadn't the time to join, can find all required content about the LinuxONE Community Cloud, upgrades to openSUSE Tumbleweed and our Containerization topics with Dockerfiles there. We have received the offer to receive VMs with "long-term access" (not only for 120 days). If you want to receive such a VM, then enter your name here: https://doodle.com/poll/wqyrphvp78um825b?utm_source=poll&utm_medium=link Others can not see your name. I will forward the number of required VMs to IBM then. Answer until Wednesday, please. Best regards, Sarah