Build images for tags matching vX.Y.Z - #627

these 5 derivations will be built:
  /nix/store/4vd8r11p787q633zgnln4jvxdil7ir4i-X-Reload-Triggers-caddy.drv
  /nix/store/5p591d0z5cip433qvvdynlpv51r4rzmp-unit-caddy.service.drv
  /nix/store/vx8rd6ll9czcj6pd6j0yhcgzqp2zm06w-system-units.drv
  /nix/store/ph0xzv0539j2w04djgg34syc9idawfqz-etc.drv
  /nix/store/ij9wqmshnh23f68s85k9zyxhayi07s9c-nixos-system-nixos-26.05.20260121.88d3861.drv
these 7 paths will be fetched (3.04 MiB download, 6.91 MiB unpacked):
  /nix/store/g6579053qn9lqhvi4sqlyi03ib6f602f-Caddyfile-formatted
  /nix/store/i92mgfj20n60n9j0xhkqasqr64zfa5nb-X-Reload-Triggers-caddy
  /nix/store/crp72zj8iyrfwqmghrx92v4f1y90kq7k-activate
  /nix/store/mif4m5yclp3k09k3rjwdk1ns592c0xic-etc
  /nix/store/wdrnl7kwx58kp86v60s8fd0khpyanmsm-psyche-book
  /nix/store/xvngiy3cfbd6ikjwahvsacrz16p2nxql-system-units
  /nix/store/n4c0xnv3l6mdavy99kwz25ybjsgzmy5r-unit-caddy.service