add documentation on the airbyte-ci development process (#34543)

airbyte-ci/connectors/pipelines/README.md

@@ -91,6 +91,25 @@ However, this will not automatically install the dependencies for the local depe
 
 Its often best to use the `poetry` steps instead.
 
+#### Running Tests
+
+From `airbyte-ci/connectors/pipelines`:
+```bash
+poetry run pytest tests
+```
+
+You can also run a subset of tests:
+```bash
+poetry run pytest pipelines/models/steps.py
+```
+
+More options, such as running test by keyword matching, are available - see the [pytest CLI documentation](https://docs.pytest.org/en/6.2.x/usage.html) for all the available options.```
+#### Checking Code Format (Pipelines)
+
+```bash
+poetry run ruff check pipelines
+```
+
 ## Commands reference
 
 At this point you can run `airbyte-ci` commands.