GCLOUD: Support ALIAS record type (#2225)

Co-authored-by: Tom Limoncelli <tal@whatexit.org>

providers/gcloud/auditrecords.go

@@ -1,10 +1,17 @@
 package gcloud
 
-import "github.com/StackExchange/dnscontrol/v3/models"
+import (
+	"github.com/StackExchange/dnscontrol/v3/models"
+	"github.com/StackExchange/dnscontrol/v3/pkg/rejectif"
+)
 
 // AuditRecords returns a list of errors corresponding to the records
 // that aren't supported by this provider.  If all records are
 // supported, an empty list is returned.
 func AuditRecords(records []*models.RecordConfig) []error {
-	return nil
+	a := rejectif.Auditor{}
+
+	a.Add("ALIAS", rejectif.LabelNotApex) // Last verified 2023-03-24
+
+	return a.Audit(records)
 }

providers/gcloud/gcloudProvider.go

@@ -23,6 +23,7 @@ import (
 
 var features = providers.DocumentationNotes{
 	providers.CanGetZones:            providers.Can(),
+	providers.CanUseAlias:            providers.Can(),
 	providers.CanUseCAA:              providers.Can(),
 	providers.CanUseDSForChildren:    providers.Can(),
 	providers.CanUseLOC:              providers.Cannot(),