Replicat ignores user-provided values for -r/--repository (always uses the default)

[vaultah]

Description

The change introduced in #13 caused a regression: no matter what users pass to the -r/--repository CLI argument, Replicat will attempt to perform actions on the repository in the current working directory, which is the default behaviour.

Cause

This is due to a bug in the Python's argparse module. Come read python/cpython#89398, it's amusing.

Affected versions

main, 1.2.1

Solution

Force Replicat to parse the -r/--repository argument twice. We'll be able to revert this solution when (if) Python core developers find time to fix (or review PRs that fix) that argparse bug. Let's not forget to verify that the fix actually works. Also, we should add tests for Replicat's CLI.