Add gitPrivateToken to Unity setup in CI workflow #5

Job	Run time
Build (Unity 6000.0 / StandaloneLinux64)	7s
Build (Unity 6000.0 / StandaloneWindows64)	8s
Build (Unity 2019.4.28f1 / StandaloneWindows64)	59s
Build (Unity 2022.3.33f1 / StandaloneWindows64)	6s
Build (Unity 2019.4.28f1 / Android)	3m 37s
Build (Unity 2022.3.33f1 / Android)	6s
Build (Unity 2022.3.33f1 / StandaloneLinux64)	6s
Build (Unity 6000.0 / Android)	6s
Build (Unity 2019.4.28f1 / StandaloneLinux64)	1m 52s
	7m 7s

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