Set target on create release with existing tag (#20381)

When you create a new release(e.g. via Tea) and specify a tag that already exists on
the repository, Gitea will instead use the `UpdateRelease`
functionality. However it currently doesn't set the Target field. This
PR fixes that.

routers/api/v1/repo/release.go

@@ -224,6 +224,7 @@ func CreateRelease(ctx *context.APIContext) {
 		rel.IsTag = false
 		rel.Repo = ctx.Repo.Repository
 		rel.Publisher = ctx.Doer
+		rel.Target = form.Target
 
 		if err = release_service.UpdateRelease(ctx.Doer, ctx.Repo.GitRepo, rel, nil, nil, nil); err != nil {
 			ctx.Error(http.StatusInternalServerError, "UpdateRelease", err)