More flexible sudo/doas/elevated access usage

[kke]

Removes the need for sudo binary for hosts with direct root access. Adds support for doas on hosts for users who prefer that.

[kke]

Weird stuff, apply goes ok, upgrade does not.

[kke]

I wonder if it's unable to write to the file because the service is running 🤔 How did it work before? Maybe upload to tmpfile anyway so you can minimize the downtime. Upload to tmp + shut down service + swap to new version + restart service.

[kke]

Odd. Uploading the new binaries stopped working because of: [ssh] 127.0.0.1:9023: upload failed: Process exited with status 1 (tee: /usr/local/bin/k0s: Text file busy\n). I don't know how it could have ever worked.

The k0s binaries need to be uploaded to some tmpfile and used from there until installed into place at some stage of the process.

[kke]

ValidateFacts finds running k0s version / if an upgrade is necessary.
UploadBinaries uploads the binaries, but it runs before ValidateFacts. 🤔