Docker Backend Multi Arch

[alberto98fx]

It would be pretty awesome to have docker as a backend with exported Bash commands that gets pwd as variable and mount some core paths to guest to persist even when a new version is released.

I.g

metacall pip3 install x

Pip folder with installed modules should be available on guest in a path such as

/opt/metacall/pip

and mounted via Docker run to the container.

[viferga]

The fallback install script to Docker has been implemented.

Shared volumes for Python and Logs are still not implemented, but it needs testing.

This is the new repo for providing a CLI image for the fallback:
https://github.com/metacall/cli

And here's the Docker Hub image:
https://hub.docker.com/repository/docker/metacall/cli

Now when trying to install in MacOs (not currently supported), it will prompt an error message and later on it will ask for installing the CLI with Docker:
curl -sL https://raw.githubusercontent.com/metacall/install/master/install.sh | bash