feat(events): Add gcpPublishEvent Groovy file (#4927) #774

Job	Run time
Start	8s
Build Piper	1m 36s
Build integration tests	14s
Run integration tests ("(TestCNBIntegrationBindings\|TestCNBIntegrationWrongBuilderProject\|TestCNB...	1m 27s
Run integration tests ("TestCNBIntegrationPreserveFiles\b")	1m 11s
Run integration tests ("TestCNBIntegrationNPMProject")	1m 46s
Run integration tests ("TestCNBIntegrationMultiImage")	2m 40s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksBuildpacklessProject")	1m 18s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksFullProject")	1m 14s
Run integration tests ("TestCNBIntegrationProjectDescriptor")	1m 14s
Run integration tests ("TestCNBIntegrationPrePostBuildpacks")	1m 31s
Run integration tests ("TestGolangIntegration")	1m 59s
Run integration tests ("TestGradleIntegration")	1m 23s
Run integration tests ("TestMavenIntegration")	1m 48s
Run integration tests ("TestMTAIntegration")	1m 49s
Run integration tests ("TestTmsUploadIntegration")	52s
Run integration tests ("TestTmsExportIntegration")	53s
Run integration tests ("Test(Gauge\|GCS\|GitHub\|GitOps\|Influx\|NPM\|Piper\|Python\|Sonar\|Vault\|Karma)In...	1m 27s
Finish	3s
	24m 33s

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