these 3 derivations will be built:
  /nix/store/rmnfqhriv9zkivrf5362a9lz4bc10fmn-talos-initramfs.cpio.xz.drv
  /nix/store/g9zdscvhfz17g1z12spjbgaw1imchkr7-talos-efi-boot.img.drv
  /nix/store/967i2xzwmfih0mgfbfp4nngxkhxl315v-talos-clone.iso.drv
building '/nix/store/rmnfqhriv9zkivrf5362a9lz4bc10fmn-talos-initramfs.cpio.xz.drv'...
building '/nix/store/g9zdscvhfz17g1z12spjbgaw1imchkr7-talos-efi-boot.img.drv'...
building '/nix/store/967i2xzwmfih0mgfbfp4nngxkhxl315v-talos-clone.iso.drv'...
xorriso 1.5.6 : RockRidge filesystem manipulator, libburnia project.

xorriso : NOTE : Environment variable SOURCE_DATE_EPOCH encountered with value 315532800
Drive current: -outdev 'stdio:/nix/store/q3977ih3q3nfibcwhx43cyaaagy44l9v-talos-clone.iso'
Media current: stdio file, overwriteable
Media status : is blank
Media summary: 0 sessions, 0 data blocks, 0 data,  179g free
Added to ISO image: directory '/'='/build/iso'
xorriso : UPDATE :       2 files added in 1 seconds
xorriso : UPDATE :       2 files added in 1 seconds
xorriso : WARNING : Boot image load size exceeds 65535 blocks of 512 bytes. Will record 0 in El Torito to extend ESP to end-of-medium.
xorriso : WARNING : EFI boot equipment is provided but no directory /EFI/BOOT
xorriso : WARNING : will emerge in the ISO filesystem. A popular method to
xorriso : WARNING : prepare a USB stick on MS-Windows relies on having in the
xorriso : WARNING : ISO filesystem a copy of the EFI System Partition tree.
ISO image produced: 146172 sectors
Written to medium : 146172 sectors at LBA 0
Writing to 'stdio:/nix/store/q3977ih3q3nfibcwhx43cyaaagy44l9v-talos-clone.iso' completed successfully.