Automatic generation of release notes (#35977)

Similar to GitHub, release notes can now be generated automatically.
The generator is server-side and gathers the merged PRs and contributors
and returns the corresponding Markdown text.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/repo/release.go

@@ -392,6 +392,32 @@ func NewRelease(ctx *context.Context) {
 	ctx.HTML(http.StatusOK, tplReleaseNew)
 }
 
+// GenerateReleaseNotes builds release notes content for the given tag and base.
+func GenerateReleaseNotes(ctx *context.Context) {
+	form := web.GetForm(ctx).(*forms.GenerateReleaseNotesForm)
+
+	if ctx.HasError() {
+		ctx.JSONError(ctx.GetErrMsg())
+		return
+	}
+
+	content, err := release_service.GenerateReleaseNotes(ctx, ctx.Repo.Repository, ctx.Repo.GitRepo, release_service.GenerateReleaseNotesOptions{
+		TagName:     form.TagName,
+		TagTarget:   form.TagTarget,
+		PreviousTag: form.PreviousTag,
+	})
+	if err != nil {
+		if errTr := util.ErrorAsTranslatable(err); errTr != nil {
+			ctx.JSONError(errTr.Translate(ctx.Locale))
+		} else {
+			ctx.ServerError("GenerateReleaseNotes", err)
+		}
+		return
+	}
+
+	ctx.JSON(http.StatusOK, map[string]any{"content": content})
+}
+
 // NewReleasePost response for creating a release
 func NewReleasePost(ctx *context.Context) {
 	newReleaseCommon(ctx)
@@ -520,11 +546,13 @@ func NewReleasePost(ctx *context.Context) {
 
 // EditRelease render release edit page
 func EditRelease(ctx *context.Context) {
+	newReleaseCommon(ctx)
+	if ctx.Written() {
+		return
+	}
+
 	ctx.Data["Title"] = ctx.Tr("repo.release.edit_release")
-	ctx.Data["PageIsReleaseList"] = true
 	ctx.Data["PageIsEditRelease"] = true
-	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
-	upload.AddUploadContext(ctx, "release")
 
 	tagName := ctx.PathParam("*")
 	rel, err := repo_model.GetRelease(ctx, ctx.Repo.Repository.ID, tagName)
@@ -565,8 +593,13 @@ func EditRelease(ctx *context.Context) {
 // EditReleasePost response for edit release
 func EditReleasePost(ctx *context.Context) {
 	form := web.GetForm(ctx).(*forms.EditReleaseForm)
+
+	newReleaseCommon(ctx)
+	if ctx.Written() {
+		return
+	}
+
 	ctx.Data["Title"] = ctx.Tr("repo.release.edit_release")
-	ctx.Data["PageIsReleaseList"] = true
 	ctx.Data["PageIsEditRelease"] = true
 
 	tagName := ctx.PathParam("*")