Add support to restore backup from a URI - local or remote

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Right now, restoring rake task is quite limited.

1. You need the tarball to be present in the backup directory
2. Tarball's name should be in a specific format

It would be useful if we could make it more flexible

1. Make the BACKUP variable accept a path to the tarball instead of just the timestamp prefix.
2. We can go even longer and make the BACKUP variable be a local or remote URI. If it is a remote URI, we download it first to the backup directory and then perform restore.

This helps it easier to do backup/restore in the world of k8s/helm charts.

/cc @Ahmadposten @DouweM