Add JSON Schema infrastructure, use for Derivation

For manual, and testing formats

src/json-schema-checks/package.nix

@@ -0,0 +1,50 @@
+# Run with: nix build .#nix-json-schema-checks
+{
+  lib,
+  mkMesonDerivation,
+
+  meson,
+  ninja,
+  jsonschema,
+
+  # Configuration Options
+
+  version,
+}:
+
+mkMesonDerivation (finalAttrs: {
+  pname = "nix-json-schema-checks";
+  inherit version;
+
+  workDir = ./.;
+  fileset = lib.fileset.unions [
+    ../../.version
+    ../../doc/manual/source/protocols/json/schema
+    ../../src/libstore-tests/data/derivation
+    ./.
+  ];
+
+  outputs = [ "out" ];
+
+  passthru.externalNativeBuildInputs = [
+    jsonschema
+  ];
+
+  nativeBuildInputs = [
+    meson
+    ninja
+  ]
+  ++ finalAttrs.passthru.externalNativeBuildInputs;
+
+  doCheck = true;
+
+  mesonCheckFlags = [ "--print-errorlogs" ];
+
+  postInstall = ''
+    touch $out
+  '';
+
+  meta = {
+    platforms = lib.platforms.all;
+  };
+})