Adapt clone step to work with customer-managed Repos (BYOG) (#4966) #799

Job	Run time
Start	14s
Build Piper	1m 24s
Build integration tests	16s
Run integration tests ("(TestCNBIntegrationBindings\|TestCNBIntegrationWrongBuilderProject\|TestCNB...	1m 43s
Run integration tests ("TestCNBIntegrationPreserveFiles\b")	1m 18s
Run integration tests ("TestCNBIntegrationNPMProject")	2m 15s
Run integration tests ("TestCNBIntegrationMultiImage")	2m 30s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksBuildpacklessProject")	1m 19s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksFullProject")	1m 18s
Run integration tests ("TestCNBIntegrationProjectDescriptor")	1m 35s
Run integration tests ("TestCNBIntegrationPrePostBuildpacks")	2m 17s
Run integration tests ("TestGolangIntegration")	1m 37s
Run integration tests ("TestGradleIntegration")	1m 17s
Run integration tests ("TestMavenIntegration")	1m 47s
Run integration tests ("TestMTAIntegration")	1m 46s
Run integration tests ("TestTmsUploadIntegration")	54s
Run integration tests ("TestTmsExportIntegration")	57s
Run integration tests ("Test(Gauge\|GCS\|GitHub\|GitOps\|Influx\|NPM\|Piper\|Python\|Sonar\|Vault\|Karma)In...	1m 33s
Finish	6s
	26m 6s

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