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All your examples are correct.
BUT: 
- all your examples assume that docker is available to the users.
- this prerequisite is not always given. And may even contradict customer-defined rules.
And as I mentioned earlier: customers pay so they define their rules.
Losing a bid just because someone deep in the background dislikes SSH access must not be acceptable.  

[I have learned my lessons using VMware long before it became an "accepted platform" ]

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