Add serve script using openapi-mock

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

openapi/.gitignore

@@ -0,0 +1 @@
+/result

openapi/flake.nix

@@ -2,16 +2,24 @@
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
   outputs =
-    { nixpkgs, ... }:
+    { nixpkgs, self, ... }:
     let
       system = "x86_64-linux";
       pkgs = import nixpkgs { inherit system; };
     in
     {
+      packages.${system} = {
+        openapi-mock = import ./openapi-mock.nix {
+          inherit (pkgs) buildGoModule fetchFromGitHub;
+        };
+      };
+
       devShells.${system}.default = pkgs.mkShell {
         packages = with pkgs; [
           openapi-generator-cli
           openapi-tui
+
+          self.packages.${system}.openapi-mock
         ];
       };
     };

openapi/openapi-mock.nix

@@ -0,0 +1,15 @@
+{ buildGoModule, fetchFromGitHub }:
+
+buildGoModule rec {
+  pname = "openapi-mock";
+  version = "0.3.9";
+
+  src = fetchFromGitHub {
+    owner = "muonsoft";
+    repo = pname;
+    rev = "v${version}";
+    hash = "sha256-7u//uwcVV1/EI6Rr3ju7KOwMYt/dXivyvBWIpTaoWZk=";
+  };
+
+  vendorHash = "sha256-KPCRunuCIbBX+YpHgshixmrxM3Ey0LIdEC0Z4CtpQoI=";
+}

openapi/serve

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+openapi-mock serve \
+  --specification-url petstore.yaml \
+  "$@"