Add terraform files and config for GCP

Signed-off-by: Somtochi Onyekwere <somtochionyekwere@gmail.com>

tests/integration/suite_test.go

@@ -45,6 +45,9 @@ const (
 	// azureTerraformPath is the path to the folder containing the
 	// terraform files for azure infra
 	azureTerraformPath = "./terraform/azure"
+	// gcpTerraformPath is the path to the folder containing the
+	// terraform files for gcp infra
+	gcpTerraformPath = "./terraform/gcp"
 
 	// kubeconfigPath is the path of the file containing the kubeconfig
 	kubeconfigPath = "./build/kubeconfig"
@@ -55,7 +58,7 @@ const (
 
 var (
 	// supportedProviders are the providers supported by the test.
-	supportedProviders = []string{"azure"}
+	supportedProviders = []string{"azure", "gcp"}
 
 	// cfg is a struct containing different variables needed for the test.
 	cfg *testConfig
@@ -269,8 +272,14 @@ func getProviderConfig(provider string) *providerConfig {
 			getTestConfig:    getTestConfigAKS,
 			registryLogin:    registryLoginACR,
 		}
+	case "gcp":
+		return &providerConfig{
+			terraformPath:    gcpTerraformPath,
+			createKubeconfig: createKubeConfigGKE,
+			getTestConfig:    getTestConfigGKE,
+			registryLogin:    registryLoginGCR,
+		}
 	}
-
 	return nil
 }