[API] Add repoCreateTag (#16165)

* Add API CreateTag

* Add Test

* API: expose Tag Message

modules/convert/convert.go

@@ -8,6 +8,7 @@ package convert
 import (
 	"fmt"
 	"strconv"
+	"strings"
 	"time"
 
 	"code.gitea.io/gitea/models"
@@ -135,6 +136,7 @@ func ToBranchProtection(bp *models.ProtectedBranch) *api.BranchProtection {
 func ToTag(repo *models.Repository, t *git.Tag) *api.Tag {
 	return &api.Tag{
 		Name:       t.Name,
+		Message:    strings.TrimSpace(t.Message),
 		ID:         t.ID.String(),
 		Commit:     ToCommitMeta(repo, t),
 		ZipballURL: util.URLJoin(repo.HTMLURL(), "archive", t.Name+".zip"),

modules/structs/repo_tag.go

@@ -7,6 +7,7 @@ package structs
 // Tag represents a repository tag
 type Tag struct {
 	Name       string      `json:"name"`
+	Message    string      `json:"message"`
 	ID         string      `json:"id"`
 	Commit     *CommitMeta `json:"commit"`
 	ZipballURL string      `json:"zipball_url"`
@@ -30,3 +31,11 @@ type AnnotatedTagObject struct {
 	URL  string `json:"url"`
 	SHA  string `json:"sha"`
 }
+
+// CreateTagOption options when creating a tag
+type CreateTagOption struct {
+	// required: true
+	TagName string `json:"tag_name" binding:"Required"`
+	Message string `json:"message"`
+	Target  string `json:"target"`
+}