storage/pkg/chroot: fix IsRootless() init #133

Job	Run time
Common: Test	8m 42s
path-filter	6s
Storage: gofix	42s
Image: Skopeo default	11m 20s
Image: Cross	45s
Storage: Cross	4m 56s
Image: Skopeo openpgp	10m 54s
Image: Test openpgp	3m 43s
Image: Test sequoia	3m 40s
Image: Test default	3m 30s
Storage: fedora-current fuse-overlay	11m 42s
Storage: debian-sid fuse-overlay	11m 49s
Storage: fedora-current overlay-transient	11m 29s
Storage: fedora-current fuse-overlay-whiteout	11m 37s
Image: Skopeo sequoia	10m 50s
Storage: debian-sid vfs	11m 43s
Storage: fedora-current btrfs	12m 42s
Storage: fedora-current vfs	11m 30s
Storage: fedora-current overlay	11m 16s
Storage: debian-sid btrfs	12m 13s
Storage: debian-sid fuse-overlay-whiteout	11m 41s
Storage: debian-sid overlay	11m 34s
Total Success	3s
	3h 8m 27s

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