Disable editing tags (#23883)

Fixes #23865

In GitHub, users cannot edit a tag.

<img
src="https://user-images.githubusercontent.com/15528715/229409445-4233941b-3a37-4846-bc0c-efa94b90d9e0.png"
width="600px" />

So in this PR the edit button will not be shown if the release's `IsTag`
is `true`

models/repo/release.go

@@ -79,7 +79,7 @@ type Release struct {
 	RenderedNote     string             `xorm:"-"`
 	IsDraft          bool               `xorm:"NOT NULL DEFAULT false"`
 	IsPrerelease     bool               `xorm:"NOT NULL DEFAULT false"`
-	IsTag            bool               `xorm:"NOT NULL DEFAULT false"`
+	IsTag            bool               `xorm:"NOT NULL DEFAULT false"` // will be true only if the record is a tag and has no related releases
 	Attachments      []*Attachment      `xorm:"-"`
 	CreatedUnix      timeutil.TimeStamp `xorm:"INDEX"`
 }

templates/repo/release/list.tmpl

@@ -93,7 +93,7 @@
 									{{end}}
 								</h4>
 								<div class="gt-df gt-ac">
-									{{if $.CanCreateRelease}}
+									{{if and $.CanCreateRelease (not .IsTag)}}
 										<a class="muted gt-ml-3 gt-df gt-ac" data-tooltip-content="{{$.locale.Tr "repo.release.edit"}}" href="{{$.RepoLink}}/releases/edit/{{.TagName | PathEscapeSegments}}" rel="nofollow">
 											{{svg "octicon-pencil"}}
 										</a>