chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

modules/actions/artifacts.go

@@ -0,0 +1,29 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package actions
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/binary"
+	"io"
+
+	"gitea.dev/modules/setting"
+)
+
+type tagType string
+
+// BuildSignature builds a hmac signature for the input values.
+// "tag" is an internal pre-defined static string to distinguish the signatures for different purpose.
+func BuildSignature(tag tagType, vals ...string) []byte {
+	m := hmac.New(sha256.New, setting.GetGeneralTokenSigningSecret())
+	_, _ = io.WriteString(m, string(tag))
+	var buf8 [8]byte
+	for _, v := range vals {
+		binary.LittleEndian.PutUint64(buf8[:], uint64(len(v)))
+		_, _ = m.Write(buf8[:])
+		_, _ = io.WriteString(m, v)
+	}
+	return m.Sum(nil)
+}