Adding custom BLS entry blocks most `bootc` operations

`bootc status` gives an "efi does not start with custom prefix" error if a custom BLS entry is present. `‎BLSConfig::get_verity` expects entries for `.efi` files to be UKI's with a name starting with `bootc_composefs-` ``` [archlinux ~]# bootc status error: Status: Getting composefs deployment status: Getting composefs deployment status: Listing bootloader entries: efi does not start with custom prefix [archlinux ~]# mv /boot/loader/entries/fwupd.conf{,.bak} [archlinux ~]# bootc status ● Booted image: 192.168.122.1/bootc-iot Digest: sha256:b71bd3f9e704a0c41e5722227c0181700062e4a46d0e9839de5df43c9dd52d86 (amd64) Verity: 1b58308f766da92eb21c7fb8c3a016d4bb5315a4b70771e014d906c2a8036f2040d625cc145986b3a8c2328cefee16c342d0d0de24b835fff1768f4476a2fe0a Version: latest (2026-06-03T07:44:07Z) Rollback image: 192.168.122.1/bootc-iot Digest: sha256:d6b21a4d2b0eb2cd0694ee71f2dcfc5720f2698b2c0324bcd364829688bfc668 (amd64) Verity: 29d1f17c5d2b8c6e86d28eb4d5df4a1ec9f7d2a7e34cd6f238bae668e9cd86310c14b17f1d4e73e353d54b57ee5702b2a291ebd1e4a62dccaa7d61bd8ece00ec Version: latest (2026-05-27T21:35:58Z) ``` Contents of `/boot/loader/entries`: ``` ==> /boot/loader/entries/bootc_arch-1b58308f766da92eb21c7fb8c3a016d4bb5315a4b70771e014d906c2a8036f2040d625cc145986b3a8c2328cefee16c342d0d0de24b835fff1768f4476a2fe0a-1.conf <== title Arch Linux version 1b58308f766da92eb21c7fb8c3a016d4bb5315a4b70771e014d906c2a8036f2040d625cc145986b3a8c2328cefee16c342d0d0de24b835fff1768f4476a2fe0a linux /EFI/Linux/bootc_composefs-1b58308f766da92eb21c7fb8c3a016d4bb5315a4b70771e014d906c2a8036f2040d625cc145986b3a8c2328cefee16c342d0d0de24b835fff1768f4476a2fe0a/vmlinuz initrd /EFI/Linux/bootc_composefs-1b58308f766da92eb21c7fb8c3a016d4bb5315a4b70771e014d906c2a8036f2040d625cc145986b3a8c2328cefee16c342d0d0de24b835fff1768f4476a2fe0a/initrd options rw composefs=1b58308f766da92eb21c7fb8c3a016d4bb5315a4b70771e014d906c2a8036f2040d625cc145986b3a8c2328cefee16c342d0d0de24b835fff1768f4476a2fe0a sort-key bootc-arch-0 ==> /boot/loader/entries/bootc_arch-29d1f17c5d2b8c6e86d28eb4d5df4a1ec9f7d2a7e34cd6f238bae668e9cd86310c14b17f1d4e73e353d54b57ee5702b2a291ebd1e4a62dccaa7d61bd8ece00ec-0.conf <== title Arch Linux version 29d1f17c5d2b8c6e86d28eb4d5df4a1ec9f7d2a7e34cd6f238bae668e9cd86310c14b17f1d4e73e353d54b57ee5702b2a291ebd1e4a62dccaa7d61bd8ece00ec linux /EFI/Linux/bootc_composefs-d9df04000c701c246c77f8937b960bbcff55e3122748915d6c794548e5611bd0dd4492d1da3451a420cd7ea3d47c4236885606a58f6fa99c9e0bb422ff3a523f/vmlinuz initrd /EFI/Linux/bootc_composefs-d9df04000c701c246c77f8937b960bbcff55e3122748915d6c794548e5611bd0dd4492d1da3451a420cd7ea3d47c4236885606a58f6fa99c9e0bb422ff3a523f/initrd options rw composefs=29d1f17c5d2b8c6e86d28eb4d5df4a1ec9f7d2a7e34cd6f238bae668e9cd86310c14b17f1d4e73e353d54b57ee5702b2a291ebd1e4a62dccaa7d61bd8ece00ec sort-key bootc-arch-1 ==> /boot/loader/entries/fwupd.conf <== title Firmware updater version 2.1.1 efi /EFI/boot/fwupdx64.efi ``` Entries not starting with `bootc_` should probably be skipped as installing things like fwupd or memtest86+ shouldn't block updates