Make git push options accept short name (#32245)

Just like what most CLI parsers do: `--opt` means `opt=true`

Then users could use `-o force-push` as `-o force-push=true`

modules/private/pushoptions_test.go

@@ -0,0 +1,30 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package private
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGitPushOptions(t *testing.T) {
+	o := GitPushOptions{}
+
+	v := o.Bool("no-such")
+	assert.False(t, v.Has())
+	assert.False(t, v.Value())
+
+	o.AddFromKeyValue("opt1=a=b")
+	o.AddFromKeyValue("opt2=false")
+	o.AddFromKeyValue("opt3=true")
+	o.AddFromKeyValue("opt4")
+
+	assert.Equal(t, "a=b", o["opt1"])
+	assert.False(t, o.Bool("opt1").Value())
+	assert.True(t, o.Bool("opt2").Has())
+	assert.False(t, o.Bool("opt2").Value())
+	assert.True(t, o.Bool("opt3").Value())
+	assert.True(t, o.Bool("opt4").Value())
+}