Improve generated integration tests

- Save logs from control(headscale) on every run to tmp
- Upgrade nix-actions
- Cancel builds if new commit is pushed
- Fix a sorting bug in user command test

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

integration/cli_test.go

@@ -99,7 +99,7 @@ func TestUserCommand(t *testing.T) {
 
 	assert.Equal(
 		t,
-		[]string{"user1", "newname"},
+		[]string{"newname", "user1"},
 		result,
 	)