Add minimal xattr support to squashfs#27
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This is only implemented to support capabilities on installed packages
This was referenced Dec 30, 2025
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This is only implemented to support capabilities on installed go packages.
It should be fairly easy to extend support for xattrs from extra_files if desired
though it would be able to use up this implementations available space quickly.
Note that this does not write multiple metadata blocks to squashfs so ends up
limited on the number and size of xattrs it is capable of writing.
As the purpose was to support 2 executables with a single xattr each the limit of
around 64 unique groups is enough. Xattrs are de-duplicated by group so if any
files share the exact same list of xattrs they will all refer to a single written xattr.