Add BATs tests for ahoy operations

[AlexSkrypnyk]

Once #110 implemented, we want to have tests that execute the same activities as a developer would do locally.

We also want to make sure that lint and test failures are picked up by scripts, meaning that we want to have a test where we introduce a failure, running a tool (phpcs, phpstan etc.) and asserting that they have indeed failed.

See https://github.com/AlexSkrypnyk/scaffold/tree/main/tests/scaffold for an example on how to setup tests. (Note that the location in that repo for Scaffold's tests is not correct - the tests should be in .scaffold/tests dir, not tests/scaffold - there is a ticket to fix that in that repo).

Please note that you would need to install ahoy into container - see https://github.com/ahoy-cli/ahoy