Add missing variable in tag list (#28305)

This fixes a regression from #25859

If a tag has no Release, Gitea will show a Link to create a Release for
the Tag if the User has the Permission to do this, but the variable to
indicate that is no longer set.

Used here:

https://github.com/go-gitea/gitea/blob/1bfcdeef4cca0f5509476358e5931c13d37ed1ca/templates/repo/tag/list.tmpl#L39-L41

routers/web/repo/release.go

@@ -174,6 +174,7 @@ func TagsList(ctx *context.Context) {
  // Disable the showCreateNewBranch form in the dropdown on this page.
  ctx.Data["CanCreateBranch"] = false
  ctx.Data["HideBranchesInDropdown"] = true
+ ctx.Data["CanCreateRelease"] = ctx.Repo.CanWrite(unit.TypeReleases) && !ctx.Repo.Repository.IsArchived
 
  listOptions := db.ListOptions{
  Page: ctx.FormInt("page"),