catch2_3: init at 3.0.1

Version 3 is not backwards compatible with version 2:
https://github.com/catchorg/Catch2/blob/v3.0.1/docs/migrate-v2-to-v3.md

pkgs/development/libraries/catch2/3.nix

···
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, python3
+}:
+
+stdenv.mkDerivation rec {
+  pname = "catch2";
+  version = "3.0.1";
+
+  src = fetchFromGitHub {
+    owner = "catchorg";
+    repo = "Catch2";
+    rev = "v${version}";
+    hash = "sha256-GcMkAgSfQnWs8wQeQD4ZMxJZED8V7FWBU04qMCutlPo=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+  ];
+
+  cmakeFlags = [
+    "-DCATCH_DEVELOPMENT_BUILD=ON"
+    "-DCATCH_BUILD_TESTING=${if doCheck then "ON" else "OFF"}"
+  ];
+
+  doCheck = true;
+
+  checkInputs = [
+    python3
+  ];
+
+  meta = {
+    description = "Modern, C++-native, test framework for unit-tests";
+    homepage = "https://github.com/catchorg/Catch2";
+    changelog = "https://github.com/catchorg/Catch2/blob/${src.rev}/docs/release-notes.md";
+    license = lib.licenses.boost;
+    maintainers = with lib.maintainers; [ dotlambda ];
+    platforms = lib.platforms.unix;
+  };
+}

pkgs/top-level/all-packages.nix

···
 
   catch2 = callPackage ../development/libraries/catch2 { };
 
+  catch2_3 = callPackage ../development/libraries/catch2/3.nix { };
+
   catdoc = callPackage ../tools/text/catdoc { };
 
   catdocx = callPackage ../tools/text/catdocx { };