ocis backup consistency --fail option

[wkloucek]

Is your feature request related to a problem? Please describe.

ocis backup consistency should have a ´--fail` option where exits with a non zero exit code if it finds inconsistencies.

Describe the solution you'd like

If the --fail flag is provided and inconsistencies are found, the exit could is != 0, eg 1.

Describe alternatives you've considered

Parse the log output for strings indicating that inconsistencies have been found but that is somehow error prone since those strings could change over time.

Additional context

Maybe this is similiar to the --fail option of curl (see https://curl.se/docs/manpage.html#-f)

cc @kobergj

[kobergj]

Should be fairly easy implementable. The curl manpage mentions it returns status code 22. Should we also return a special status code? Or we just go with generic 1?

[wkloucek]

Or we just go with generic 1?

1 would be fine for me