cache: fix cache leak #4353
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cache: fix cache leak #4353
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After loading snapshot failed in the func init(), the compression variants lease was not cleaned, resulting in cache data not being garbage collected；
After run
buildctl prune --all，there are still hundreds of GB of data remaining in the /var/lib/buildkit/runc-overlayfs/content/blobs/sha256/ directory；the error info：
level=debug msg="could not load snapshot zy9eqBpcso79doeajneev8iii: not found\n..."
Signed-off-by: fanjiyun.fjy [email protected]