go run ./cmd/librarian release

2025/08/13 21:13:21 INFO librarian arguments=[release]
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1029a99b8]

goroutine 1 [running]:
github.com/googleapis/librarian/internal/librarian.Run({0x102becff0, 0x102f36360}, {0x1400001e110, 0x1, 0x1})
	/Users/julieqiu/code/googleapis/librarian/internal/librarian/librarian.go:76 +0x1c8
main.main()
	/Users/julieqiu/code/googleapis/librarian/cmd/librarian/main.go:31 +0x64
exit status 2