feat(rdb): fetch latest engine version from API (scaleway#2317)

Author: jremy42

api/rdb/v1/rdb_utils.go

@@ -1,6 +1,7 @@
 package rdb
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/scaleway/scaleway-sdk-go/errors"
@@ -199,3 +200,25 @@ func (s *API) WaitForReadReplica(req *WaitForReadReplicaRequest, opts ...scw.Req
 	}
 	return readReplica.(*ReadReplica), nil
 }
+
+func (s *API) FetchLatestEngineVersion(engineName string) (*EngineVersion, error) {
+	engines, err := s.ListDatabaseEngines(&ListDatabaseEnginesRequest{})
+	if err != nil {
+		return nil, err
+	}
+
+	var latestEngineVersion *EngineVersion
+	for _, engine := range engines.Engines {
+		if engine.Name == engineName {
+			if len(engine.Versions) > 0 {
+				latestEngineVersion = engine.Versions[0]
+				break
+			}
+		}
+	}
+
+	if latestEngineVersion == nil {
+		return nil, fmt.Errorf("no versions found for engine: %s", engineName)
+	}
+	return latestEngineVersion, nil
+}