Supports wildcard protected branch (#20825)

This PR introduce glob match for protected branch name. The separator is
`/` and you can use `*` matching non-separator chars and use `**` across
separator.

It also supports input an exist or non-exist branch name as matching
condition and branch name condition has high priority than glob rule.

Should fix #2529 and #15705

screenshots

<img width="1160" alt="image"
src="https://user-images.githubusercontent.com/81045/205651179-ebb5492a-4ade-4bb4-a13c-965e8c927063.png">

Co-authored-by: zeripath <art27@cantab.net>

models/git/protected_branch_test.go

@@ -0,0 +1,78 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBranchRuleMatch(t *testing.T) {
+	kases := []struct {
+		Rule          string
+		BranchName    string
+		ExpectedMatch bool
+	}{
+		{
+			Rule:          "release/*",
+			BranchName:    "release/v1.17",
+			ExpectedMatch: true,
+		},
+		{
+			Rule:          "release/**/v1.17",
+			BranchName:    "release/test/v1.17",
+			ExpectedMatch: true,
+		},
+		{
+			Rule:          "release/**/v1.17",
+			BranchName:    "release/test/1/v1.17",
+			ExpectedMatch: true,
+		},
+		{
+			Rule:          "release/*/v1.17",
+			BranchName:    "release/test/1/v1.17",
+			ExpectedMatch: false,
+		},
+		{
+			Rule:          "release/v*",
+			BranchName:    "release/v1.16",
+			ExpectedMatch: true,
+		},
+		{
+			Rule:          "*",
+			BranchName:    "release/v1.16",
+			ExpectedMatch: false,
+		},
+		{
+			Rule:          "**",
+			BranchName:    "release/v1.16",
+			ExpectedMatch: true,
+		},
+		{
+			Rule:          "main",
+			BranchName:    "main",
+			ExpectedMatch: true,
+		},
+		{
+			Rule:          "master",
+			BranchName:    "main",
+			ExpectedMatch: false,
+		},
+	}
+
+	for _, kase := range kases {
+		pb := ProtectedBranch{RuleName: kase.Rule}
+		var should, infact string
+		if !kase.ExpectedMatch {
+			should = " not"
+		} else {
+			infact = " not"
+		}
+		assert.EqualValues(t, kase.ExpectedMatch, pb.Match(kase.BranchName),
+			fmt.Sprintf("%s should%s match %s but it is%s", kase.BranchName, should, kase.Rule, infact),
+		)
+	}
+}