- Move public keys collection to a class method on `SopsKey`, and
implement collection for each key type in `KeyType`, this helps make
the code more generic ;
- Replace `Operation.__call__` by `run` (`sops.run` if you import the
entire module), that allows us to dedent the code so that's cool ;
- Fix exception handling when trying to get a in-memory temporary file ;
- Make Executor cuter 😵🪦.
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