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Speed up image pulling

I looked at current master installation and saw that pulling the rocketchat image alone (439MB) took 8 minutes !

root@master:~# kubectl -n oas-apps describe pod rocketchat-rocketchat-857c9d5c9f-7xfwz
  Normal   Pulling    41m                kubelet, master    Pulling image "open.greenhost.net:4567/openappstack/openappstack/rocketchat:3.2.2-096aa0023"
  Normal   Pulled     33m                kubelet, master    Successfully pulled image "open.greenhost.net:4567/openappstack/openappstack/rocketchat:3.2.2-096aa0023"

root@master:~# crictl images |grep rocket
open.greenhost.net:4567/openappstack/openappstack/rocketchat                3.2.2-096aa0023         70286d69ba81b       439MB
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