The pattern was added in 6242cda99d9194efec20997697d703c0c005dbd4, with the idea that users will have local configuration files for mkosi and git should not bother them about those. But let's make this narrower, and only match files with "local". This way we reduce the risk that some unrelated file will be ignored by accident. .gitignore in the parent directory is used, because mkosi apparently tries to load all files under mkosi.default.d/, without looking at the extension. This is probably something to fix in mkosi too.
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