Run Tarantool binary only in Docker container when using tt pack --use-docker

[hackallcode]

I want to package an application for Linux on my MacBook. For this, I use the --use-docker option (similar to cartridge cli). But I encounter the fact that tt tries to run Tarantool on my MacBook and the packaging fails. cartridge cli, in turn, worked fine, and in addition to defining Tarantool via env, you could specify the path to the folder with Tarantool for Linux.

So, let's add the ability to specify the Tarantool directory and run the Tarantool executable in a Docker container.