convert perl to nix

runtimes/default.nix

@@ -27,4 +27,5 @@ args: {
     "prolog" = import ./prolog.nix args;
     "ponylang" = import ./ponylang.nix args;
     "php" = import ./php.nix args;
+    "perl" = import ./perl.nix args;
 }

runtimes/perl.nix

@@ -0,0 +1,29 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.perl; 
+in piston.mkRuntime {
+    language = "perl";
+    version = pkg.version;
+
+    aliases = [
+        "pl"
+    ];
+
+    run = ''
+        ${pkg}/bin/perl "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.pl" = ''
+                    print("OK")
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "test.pl";
+        })
+    ];
+}