Adam Scott f18a4e1810 Ensure new cover images only use basic image formats (#1229) ...

- Add new filter `ensure_magic_type` (`_plugins/ensure_magic_type.rb`) that checks the input magic type and compares it to its parameter. If it doesn't match, it fails the build. There's optional context parameters to explain the check.

- Add new filter `is_legacy_cover_image` (`_plugins/is_legacy.rb`) that
is essentially a grand-fathered clause check to see if we apply
a `ensure_magic_type` check for the cover image.

2026-01-21 11:40:32 +01:00

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