A pattern has emerged where a integration tests check for the
availability of an external tool (`git`, `taplo`, `gpg`, ...) and skip
the test (by simply passing it) when it is not available. To check this,
the program is run with the `--version` flag.
Some tests require that the program be available at least when running
in CI, by calling `ensure_running_outside_ci` conditionally on the
outcome. The decision is up to each test, though, the utility merely
returns a `bool`.
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