Ignore EngineVersion minor updates when autoMinorVersionUpgrade is enabled (#166)

Fixes [Issue](aws-controllers-k8s/community#2009)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: joaquinservetto

pkg/resource/db_cluster/custom_update.go

@@ -15,6 +15,7 @@ package db_cluster
 
 import (
 	"context"
+	"regexp"
 	"slices"
 
 	ackv1alpha1 "github.com/aws-controllers-k8s/runtime/apis/core/v1alpha1"
@@ -28,6 +29,8 @@ import (
 	svcapitypes "github.com/aws-controllers-k8s/rds-controller/apis/v1alpha1"
 )
 
+var r = regexp.MustCompile(`[0-9]*$`)
+
 // customUpdate is required to fix
 // https://github.com/aws-controllers-k8s/community/issues/917. The Input shape
 // sent to ModifyDBCluster MUST have fields that are unchanged between desired
@@ -577,7 +580,9 @@ func (rm *resourceManager) newCustomUpdateRequestPayload(
 		res.SetEnableIAMDatabaseAuthentication(*desired.ko.Spec.EnableIAMDatabaseAuthentication)
 	}
 	if desired.ko.Spec.EngineVersion != nil && delta.DifferentAt("Spec.EngineVersion") {
-		res.SetEngineVersion(*desired.ko.Spec.EngineVersion)
+		if requireEngineVersionUpdate(desired.ko.Spec.EngineVersion, latest.ko.Spec.EngineVersion, *desired.ko.Spec.AutoMinorVersionUpgrade) {
+			res.SetEngineVersion(*desired.ko.Spec.EngineVersion)
+		}
 	}
 	if desired.ko.Spec.MasterUserPassword != nil && delta.DifferentAt("Spec.MasterUserPassword") {
 		tmpSecret, err := rm.rr.SecretValueFromReference(ctx, desired.ko.Spec.MasterUserPassword)
@@ -672,3 +677,9 @@ func getCloudwatchLogExportsConfigDifferences(cloudwatchLogExportsConfigDesired
 	}
 	return logsTypesToEnable, logsTypesToDisable
 }
+
+func requireEngineVersionUpdate(desiredEngineVersion *string, latestEngineVersion *string, autoMinorVersionUpgrade bool) bool {
+	desiredMajorEngineVersion := r.ReplaceAllString(*desiredEngineVersion, "${1}")
+	latestMajorEngineVersion := r.ReplaceAllString(*latestEngineVersion, "${1}")
+	return !autoMinorVersionUpgrade || desiredMajorEngineVersion != latestMajorEngineVersion
+}