Document CLI commands that are compatible with open-balena

[dfunckt]

The CLI has a bunch of commands that still assume balenaCloud as the target and won't work with open-balena, for example balena push.

We should document the exact set of commands that are supported and guarantee they work when targeting open-balena going forward.

cc @shaunmulligan @pimterry

[velosol]

See also: balena-io/balena-cli#1610

[danclimasevschi]

In addition to that, not all balena-cli commands are documented, i.e. balena-io/balena-cli#2613

[ab77]

@dfunckt this is probably done, right?

[dfunckt]

It isn’t. I think we should have a section in the README or a page in docs about working with the CLI (which is the sole user interface to openBalena) where we list the missing commands and their alternatives.

Off the top of my head, the commands that won’t work are:

• os download, due to lack of image-maker. Download images from balena.io/os
• push. Use build/deploy instead
• anything related to proxy, such as host OS updates. No alternative yet.