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

these 8 derivations will be built:
  /nix/store/prlg4a6zym8c307sjwfzcbhvabizmpz7-X-Reload-Triggers-caddy.drv
  /nix/store/9lbxhvqlifsz41faw47maic3bbwbivgi-unit-caddy.service.drv
  /nix/store/j1hwd5l4cqpg0p18pxmbhhn0b5gkx8lw-website-backend-1.0.0.drv
  /nix/store/p2qj7si9kh6l7sy6ij0p9wbmzybmch95-unit-backend.service.drv
  /nix/store/18wpm1zabxhwrq48n7fhc3idfwvhvd5p-system-units.drv
  /nix/store/sz7ci03qswr1p0ym8fhjr7yyswav05vr-etc.drv
  /nix/store/8bsqy0gmna7mja90z929qpbhx13pfmhm-activate.drv
  /nix/store/nz27nbv66l0q8cnx1smahmc5iw4sh6km-nixos-system-nixos-26.05.20260121.88d3861.drv
this path will be fetched (0.00 MiB download, 0.00 MiB unpacked):
  /nix/store/ac7dfgl3b82dmvdw4aria9c9kxmmbqnx-Caddyfile-formatted