restic/changelog/unreleased/issue-4568

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Bugfix: Prevent `forget --keep-tags invalid` from deleting all snapshots
Running `forget --keep-tags invalid`, where the tag `invalid` does not
exist in the repository, would remove all snapshots. This is especially
problematic if the tag name contains a typo.
The `forget` command now fails with an error if all snapshots in a snapshot
group would be deleted. This prevents the above example from deleting all
snapshots.
It is possible to temporarily disable the new check by setting the environment variable
`RESTIC_FEATURES=safe-forget-keep-tags=false`. Note that this feature flag
will be removed in the next minor restic version.
https://github.com/restic/restic/issues/4568
https://github.com/restic/restic/pull/4764
https://forum.restic.net/t/delete-all-snapshots-in-one-command-is-this-feature-intentional/6923/3