buf: Patch out flakey test

pkgs/development/tools/buf/default.nix

@@ -26,6 +26,10 @@ buildGoModule rec {
     ./skip_test_requiring_network.patch
     # Skip TestWorkspaceGit which requires .git and commits.
     ./skip_test_requiring_dotgit.patch
+    # Skips the invalid_upstream test as it is flakey. Based on upstream commit
+    # 27930caf2eb35c2592a77f59ed5afe4d9e2fb7ea.
+    # This patch may be removed on the next buf update.
+    ./skip_test_invalid_upstream_flakey.patch
   ];
 
   nativeBuildInputs = [ installShellFiles ];

pkgs/development/tools/buf/skip_test_invalid_upstream_flakey.patch

@@ -0,0 +1,24 @@
+diff --git a/private/bufpkg/bufstudioagent/bufstudioagent_test.go b/private/bufpkg/bufstudioagent/bufstudioagent_test.go
+index 6e010937..9cacc082 100644
+--- a/private/bufpkg/bufstudioagent/bufstudioagent_test.go
++++ b/private/bufpkg/bufstudioagent/bufstudioagent_test.go
+@@ -186,6 +186,19 @@ func testPlainPostHandlerErrors(t *testing.T, upstreamServer *httptest.Server) {
+ 	})
+ 
+ 	t.Run("invalid_upstream", func(t *testing.T) {
++		// TODO: unskip this test. This is flaky because of two reasons:
++		//
++		// 1. When a connection is closed, the underlying HTTP client does not
++		// always knows it, since the http handler implementation in go has no way
++		// of changing the connection timeout. See:
++		// https://github.com/golang/go/issues/16100
++		//
++		// 2. The expected status code is `StatusBadGateway` since the issue
++		// happened client-side (a response never came back from the server). This
++		// is not deterministic in the business logic because we're based on the
++		// connect error code that's returned. See
++		// https://linear.app/bufbuild/issue/BSR-383/flaky-test-in-bufstudioagent-testgo
++		t.SkipNow()
+ 		listener, err := net.Listen("tcp", "127.0.0.1:")
+ 		require.NoError(t, err)
+ 		go func() {