chore: enable a dummy DCO app to unblock the merge queue #7601

Job	Run time
Python Build (Python 3.10 PyArrow latest)	5m 0s
lint	1m 36s
Python Build (Python 3.8 PyArrow 16.0.0)	12m 0s
PySpark Integration Tests	4m 35s
Running with Python 3.8	3m 8s
Running with Python 3.9	3m 10s
Running with Python 3.10	3m 10s
Running with Python 3.11	3m 16s
Running with Python 3.12	3m 15s
	39m 10s

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