Merge branch 'nd/worktree-add-lock'

Allow to lock a worktree immediately after it's created. This helps
prevent a race between "git worktree add; git worktree lock" and
"git worktree prune".

* nd/worktree-add-lock:
  worktree add: add --lock option

t/t2025-worktree-add.sh

@@ -63,6 +63,12 @@ test_expect_success '"add" worktree' '
 	)
 '
 
+test_expect_success '"add" worktree with lock' '
+	git rev-parse HEAD >expect &&
+	git worktree add --detach --lock here-with-lock master &&
+	test -f .git/worktrees/here-with-lock/locked
+'
+
 test_expect_success '"add" worktree from a subdir' '
 	(
 		mkdir sub &&