Fix: export flake template (#26)

Author: urso

flake.nix

@@ -54,6 +54,14 @@
         };
       };
 
+      flake.templates = rec {
+        default = init;
+        init = {
+          path = ./nix/templates/init;
+          description = "Initialize postgres extension projects";
+        };
+      };
+
       systems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
 
       perSystem = {