fix: change permissions of read-only files before extracting in cache restore (#20241)

[ChickenisLegit]

Closes #20241.

This PR fixes a PermissionError that occurs on Windows when running conan cache restore to extract an archive that contains read-only files (e.g., from an MSYS2 environment or a Git pack idx). Python's tarfile.extractall() is unable to overwrite these existing read-only files if they already exist in the cache folder, which causes the restore process to fail with PermissionError: [Errno 13] Permission denied.

Changes

• Updated conan/api/subapi/cache.py to iterate through the members of the tar archive and explicitly set the read/write permissions (os.chmod(target_path, stat.S_IWRITE | stat.S_IREAD)) on existing files in the cache destination before extractall() attempts to overwrite them.

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[ChickenisLegit]

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