test: moar integration tests [ci skip]

tests/README.md

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+# Test suite
+
+* Unit testing is done in the packages themselves, run `find . -name
+  "*_test.go"` to find those. Use `make test` to run the entire unit test
+  suite. Some unit tests require mocked files which are located in
+  `./tests/resources.`
+
+* Integration tests are in `./tests/integration`. Please see [these
+  docs](https://docs.coopcloud.tech/abra/hack/#integration-tests) for
+  instructions and tips on how to run them.