Fix go-playground

bin/go-playground

@@ -1,5 +1,42 @@
 #!/bin/sh
-cd "$(mktemp -d)";
-go mod init local-playground;
-echo 'package main\n\nimport (\n\t"fmt"\n)\n\nfunc main() {\n\tfmt.Println("aloha")\n}\n' > main.go;
-$EDITOR main.go;
+
+set -e -x
+
+cd "$(mktemp -d)"
+
+cat >main.go <<EOF
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	fmt.Println("aloha")
+}
+EOF
+
+cat >shell.nix <<EOF
+let
+    pkgsVersion = "22.11";
+    pkgsSrc = fetchTarball {
+      name = "nixpkgs-\${pkgsVersion}";
+      url = "https://github.com/NixOS/nixpkgs/archive/ce20e9ebe1903ea2ba1ab006ec63093020c761cb.tar.gz";
+      sha256 = "sha256-eFNm2h6fNbgD7ZpO4MHikCB5pSnCJ7DTmwPisjetmwc=";
+    };
+    pkgs = (import pkgsSrc) {};
+in
+    pkgs.mkShell {
+        buildInputs = [
+            pkgs.go
+            pkgs.golangci-lint
+        ];
+
+        shellHook = ''
+            go mod init local-playground
+            $EDITOR main.go
+        '';
+    }
+EOF
+
+nix-shell -v