build new 8.0 and 8.1 images

nix/image/php.nix

@@ -3,7 +3,9 @@
   php,
   debug ? false,
 }: let
+  inherit (builtins) compareVersions;
   inherit (lib) optionals;
+  withBlackfire = !debug && ((compareVersions php.version "8.1.0") == 1);
 in
   php.buildEnv {
     extensions = {
@@ -36,6 +38,8 @@ in
         ]
         ++ optionals (!debug) [
           smbclient # this breaks the build for no apparent reason
+        ]
+        ++ optionals withBlackfire [
           blackfire
         ]);
     extraConfig = ''