main/mkinitfs: insecure initramfs file permissions
According to CVE-2012-4453 (link) and familiar. Here some discussion (link) + something extra to read about (link). Alpine currently using umask 0022 (https://git.alpinelinux.org/mkinitfs/tree/mkinitfs.in#n156) but should be 0077.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information