Fix cluster network mapping (#375)

* Make cluster network computed

* Replace computed with better mapping

* Fix comment

* Update unit test§

stackit/internal/services/ske/cluster/resource.go

@@ -1486,6 +1486,17 @@ func mapNetwork(cl *ske.Cluster, m *Model) error {
 		return nil
 	}
 
+	// If the network field is not provided, the SKE API returns an empty object.
+	// If we parse that object into the terraform model, it will produce an inconsistent result after apply error
+
+	emptyNetwork := &ske.V1Network{}
+	if *cl.Network == *emptyNetwork && m.Network.IsNull() {
+		if m.Network.Attributes() == nil {
+			m.Network = types.ObjectNull(networkTypes)
+		}
+		return nil
+	}
+
 	id := types.StringNull()
 	if cl.Network.Id != nil {
 		id = types.StringValue(*cl.Network.Id)

stackit/internal/services/ske/cluster/resource_test.go

@@ -231,7 +231,7 @@ func TestMapFields(t *testing.T) {
 			true,
 		},
 		{
-			"nil_network_id",
+			"empty_network",
 			types.ObjectNull(extensionsTypes),
 			&ske.Cluster{
 				Name:    utils.Ptr("name"),
@@ -245,12 +245,10 @@ func TestMapFields(t *testing.T) {
 				AllowPrivilegedContainers: types.BoolNull(),
 				NodePools:                 types.ListNull(types.ObjectType{AttrTypes: nodePoolTypes}),
 				Maintenance:               types.ObjectNull(maintenanceTypes),
-				Network: types.ObjectValueMust(networkTypes, map[string]attr.Value{
-					"id": types.StringNull(),
-				}),
-				Hibernations: types.ListNull(types.ObjectType{AttrTypes: hibernationTypes}),
-				Extensions:   types.ObjectNull(extensionsTypes),
-				KubeConfig:   types.StringNull(),
+				Network:                   types.ObjectNull(networkTypes),
+				Hibernations:              types.ListNull(types.ObjectType{AttrTypes: hibernationTypes}),
+				Extensions:                types.ObjectNull(extensionsTypes),
+				KubeConfig:                types.StringNull(),
 			},
 			true,
 		},