Fix repo init README EOL (#37388)

Fix #27120

By the way, refactor ReserveLineBreakForTextarea to NormalizeStringEOL

services/repository/create.go

@@ -31,6 +31,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/templates/vars"
+	"code.gitea.io/gitea/modules/util"
 )
 
 // CreateRepoOptions contains the create repository options
@@ -85,7 +86,7 @@ func prepareRepoCommit(ctx context.Context, repo *repo_model.Repository, tmpDir
 	cloneLink := repo.CloneLink(ctx, nil /* no doer so do not generate user-related SSH link */)
 	match := map[string]string{
 		"Name":           repo.Name,
-		"Description":    repo.Description,
+		"Description":    util.NormalizeStringEOL(repo.Description),
 		"CloneURL.SSH":   cloneLink.SSH,
 		"CloneURL.HTTPS": cloneLink.HTTPS,
 		"OwnerName":      repo.OwnerName,