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[SPARK-49845][CORE] Make `appArgs` and `environmentVariables` optiona… #63

Job	Run time
Run / Check changes	32s
Run / Base image build	47s
Run / Run Docker integration tests	0s
Run / Build modules: ${{ matrix.modules }} ${{ matrix.comment }}	0s
Run / Run Spark on Kubernetes Integration test	0s
Run / Protobuf breaking change detection and Python CodeGen check	58s
Run / Run TPC-DS queries with SF=1	0s
Run / Run Spark UI tests	22s
Run / Linters, licenses, and dependencies	29m 36s
Run / Build modules: sparkr	0s
Run / Build modules: ${{ matrix.modules }}	0s
Run / Documentation generation	15m 52s
	48m 7s

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