Test CLI commands Closer to Real User Experience

[skorfmann]

The init command was broken due to the input options being colorized via ansi codes, which the user realistically can't provide. The bug wasn't surfaced in the integration tests, since colourizing is automatically disabled in CI envs (see https://github.com/chalk/supports-color)

We need some kind of integration test, which actually resembles the real user experience as close a possible, to prevent bugs like this in the future.

Related to #139 and #140

[github-actions]

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