ssh/tailssh: mark TestSSHRecordingCancelsSessionsOnUploadFailure as flaky (again)

This test is still flaking on macOS, so mark it as such so we can track
and investigate further.

Updates #7707

Change-Id: I640da3c1068a90a9815caab2df9431bceb01f846
Signed-off-by: Alex Chan <alexc@tailscale.com>

ssh/tailssh/tailssh_test.go

@@ -36,6 +36,7 @@ import (
 	gliderssh "github.com/tailscale/gliderssh"
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/h2c"
+	"tailscale.com/cmd/testwrapper/flakytest"
 	"tailscale.com/ipn/ipnlocal"
 	"tailscale.com/ipn/store/mem"
 	"tailscale.com/net/memnet"
@@ -476,6 +477,9 @@ func newSSHRule(action *tailcfg.SSHAction) *tailcfg.SSHRule {
 }
 
 func TestSSHRecordingCancelsSessionsOnUploadFailure(t *testing.T) {
+	if runtime.GOOS == "darwin" {
+		flakytest.Mark(t, "https://github.com/tailscale/tailscale/issues/7707")
+	}
 	if runtime.GOOS != "linux" && runtime.GOOS != "darwin" {
 		t.Skipf("skipping on %q; only runs on linux and darwin", runtime.GOOS)
 	}