Add the equivalent of restic restore --delete option during a k8up restore

[s4ndalHat]

Summary

As "k8up user"
I want "to be able to delete destination data files that are not in my snapshot"
So that "I keep a consistent data in my restore "

Context

During a restore, k8up doesn't delete datas that are old in the destination path during a multi cluster scenario.
That would be problematic when old datas are still in my destination path and so my datas are not consistent.

As example in a nextcloud environnement, I still have old data files that are already deleted and missing in my snapshot.

I am aware that restic keep data update when the file are present, but I think it doesn't delete old files for my case.

Out of Scope

No response

Further links

No response

Acceptance Criteria

No response

Implementation Ideas

No response

[s4ndalHat]

I saw that in the values.yaml, I can pass envVars to add RESTIC_OPTIONS as addition env,
But in the doc it expect to have a key=value for this env...
Not quite sure how to correctly set this up, but I will do some tests

[s4ndalHat]

Silly me, I saw a current open PR linked to the add of latest restic version (because its a new feature in the latest version of restic): #1001

Would be cool if its possible for us, end users to include these additional options during restore, especially --delete, it fits well for my use case.