Move more functions to db.Find (#28419)

Following #28220

This PR move more functions to use `db.Find`.

---------

Co-authored-by: delvh <dev.lh@web.de>

models/asymkey/gpg_key_list.go

@@ -0,0 +1,38 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package asymkey
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+type GPGKeyList []*GPGKey
+
+func (keys GPGKeyList) keyIDs() []string {
+	ids := make([]string, len(keys))
+	for i, key := range keys {
+		ids[i] = key.KeyID
+	}
+	return ids
+}
+
+func (keys GPGKeyList) LoadSubKeys(ctx context.Context) error {
+	subKeys := make([]*GPGKey, 0, len(keys))
+	if err := db.GetEngine(ctx).In("primary_key_id", keys.keyIDs()).Find(&subKeys); err != nil {
+		return err
+	}
+	subKeysMap := make(map[string][]*GPGKey, len(subKeys))
+	for _, key := range subKeys {
+		subKeysMap[key.PrimaryKeyID] = append(subKeysMap[key.PrimaryKeyID], key)
+	}
+
+	for _, key := range keys {
+		if subKeys, ok := subKeysMap[key.KeyID]; ok {
+			key.SubsKey = subKeys
+		}
+	}
+	return nil
+}