git-revise: macOS: Skip failing GPG test

Fixes a failure due to no GPG agent being run for the test suite:

```
E               subprocess.CalledProcessError: Command '['gpg', '--batch', '--passphrase', '', '--quick-gen-key', b'Test User <[email protected]>']' returned non-zero exit status 2.

/nix/store/wwqdmdr2f5wrjnsjs64bny8df471rh9b-python3-3.12.9/lib/python3.12/subprocess.py:573: CalledProcessError
----------------------------- Captured stdout call -----------------------------
[master (root-commit) 5aa2dc9] commit 1
 Author: Bash Author <[email protected]>
----------------------------- Captured stderr call -----------------------------
gpg: keybox '/private/tmp/nix-build-python3.12-git-revise-0.7.0-unstable-2025-01-28.drv-0/tmpfmshzluc/pubring.kbx' created
gpg: error running '/nix/store/69pwwprid9rhgkz9ip9nq71p0r2b73b7-gnupg-2.4.7/bin/gpg-agent': exit status 2
gpg: failed to start gpg-agent '/nix/store/69pwwprid9rhgkz9ip9nq71p0r2b73b7-gnupg-2.4.7/bin/gpg-agent': General error
gpg: can't connect to the gpg-agent: General error
gpg: agent_genkey failed: No agent running
gpg: key generation failed: No agent running
=========================== short test summary info ============================
FAILED tests/test_gpgsign.py::test_gpgsign - subprocess.CalledProcessError: Command '['gpg', '--batch', '--passphrase', ...
======================== 1 failed, 37 passed in 20.81s =========================
```

I've also marked myself as a maintiner, as @emilazy no longer uses Git
directly.

Author: 9999years

pkgs/development/python-modules/git-revise/default.nix

@@ -1,5 +1,6 @@
 {
   lib,
+  stdenv,
   buildPythonPackage,
   pythonOlder,
   git,
@@ -23,10 +24,18 @@ buildPythonPackage rec {
 
   disabled = pythonOlder "3.8";
 
-  nativeCheckInputs = [
-    git
-    gnupg
-    pytestCheckHook
+  nativeCheckInputs =
+    [
+      git
+      pytestCheckHook
+    ]
+    ++ lib.optionals (!stdenv.hostPlatform.isDarwin) [
+      gnupg
+    ];
+
+  disabledTests = lib.optionals stdenv.hostPlatform.isDarwin [
+    # `gpg: agent_genkey failed: No agent running`
+    "test_gpgsign"
   ];
 
   meta = with lib; {
@@ -35,6 +44,6 @@ buildPythonPackage rec {
     changelog = "https://github.com/mystor/git-revise/blob/${version}/CHANGELOG.md";
     license = licenses.mit;
     mainProgram = "git-revise";
-    maintainers = with maintainers; [ emily ];
+    maintainers = with maintainers; [ _9999years ];
   };
 }