Add option to initialize repository with labels (#6061)

* Add optional label sets on repo creation

* Fix CRLF

* Instead of hardcoding default, make it the helper

* Move label set init out of repo init

Add a new error for the router
Combine router label init with repo creation label init

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Add issue labels to Swagger for repo creation

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Update models/issue_label.go

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Update models/issue_label.go

Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>

routers/repo/repo.go

@@ -115,6 +115,7 @@ func Create(ctx *context.Context) {
 
 	// Give default value for template to render.
 	ctx.Data["Gitignores"] = models.Gitignores
+	ctx.Data["LabelTemplates"] = models.LabelTemplates
 	ctx.Data["Licenses"] = models.Licenses
 	ctx.Data["Readmes"] = models.Readmes
 	ctx.Data["readme"] = "Default"
@@ -155,6 +156,7 @@ func CreatePost(ctx *context.Context, form auth.CreateRepoForm) {
 	ctx.Data["Title"] = ctx.Tr("new_repo")
 
 	ctx.Data["Gitignores"] = models.Gitignores
+	ctx.Data["LabelTemplates"] = models.LabelTemplates
 	ctx.Data["Licenses"] = models.Licenses
 	ctx.Data["Readmes"] = models.Readmes
 
@@ -173,6 +175,7 @@ func CreatePost(ctx *context.Context, form auth.CreateRepoForm) {
 		Name:        form.RepoName,
 		Description: form.Description,
 		Gitignores:  form.Gitignores,
+		IssueLabels: form.IssueLabels,
 		License:     form.License,
 		Readme:      form.Readme,
 		IsPrivate:   form.Private || setting.Repository.ForcePrivate,