Merge pull request #28602 from brittandeyoung/f-aws_lightsail_instance_add_on

Enhancement: `aws_lightsail_instance` add support for `add_on`

Author: ewbankkit

.changelog/28602.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/aws_lightsail_instance: Add `add_on` configuration block.
+```

internal/service/lightsail/find.go

@@ -430,3 +430,25 @@ func FindBucketById(ctx context.Context, conn *lightsail.Lightsail, id string) (
 
 	return out.Buckets[0], nil
 }
+
+func FindInstanceById(ctx context.Context, conn *lightsail.Lightsail, id string) (*lightsail.Instance, error) {
+	in := &lightsail.GetInstanceInput{InstanceName: aws.String(id)}
+	out, err := conn.GetInstanceWithContext(ctx, in)
+
+	if tfawserr.ErrCodeEquals(err, lightsail.ErrCodeNotFoundException) {
+		return nil, &resource.NotFoundError{
+			LastError:   err,
+			LastRequest: in,
+		}
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	if out == nil || out.Instance == nil {
+		return nil, tfresource.NewEmptyResultError(in)
+	}
+
+	return out.Instance, nil
+}