feat: Add imagePushToRegistry step (#4609) #643

Job	Run time
Start	11s
Build integration tests	23s
Build Piper	1m 39s
Run integration tests ("(TestCNBIntegrationBindings\|TestCNBIntegrationWrongBuilderProject\|TestCNB...	1m 28s
Run integration tests ("TestCNBIntegrationPreserveFiles\b")	1m 29s
Run integration tests ("TestCNBIntegrationNPMProject")	2m 0s
Run integration tests ("TestCNBIntegrationMultiImage")	2m 54s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksBuildpacklessProject")	1m 22s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksFullProject")	1m 16s
Run integration tests ("TestCNBIntegrationProjectDescriptor")	1m 13s
Run integration tests ("TestCNBIntegrationPrePostBuildpacks")	1m 21s
Run integration tests ("TestGolangIntegration")	1m 52s
Run integration tests ("TestGradleIntegration")	1m 24s
Run integration tests ("TestMavenIntegration")	1m 46s
Run integration tests ("TestMTAIntegration")	2m 1s
Run integration tests ("TestTmsUploadIntegration")	1m 6s
Run integration tests ("TestTmsExportIntegration")	55s
Run integration tests ("Test(Gauge\|GCS\|GitHub\|GitOps\|Influx\|NPM\|Piper\|Python\|Sonar\|Vault\|Karma)In...	1m 19s
Finish	3s
	25m 42s

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