Close the gitrepo when deleting the repository (#15876) (#15887)

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: zeripath <art27@cantab.net>

routers/api/v1/repo/repo.go

@@ -885,6 +885,10 @@ func Delete(ctx *context.APIContext) {
 		return
 	}
 
+	if ctx.Repo.GitRepo != nil {
+		ctx.Repo.GitRepo.Close()
+	}
+
 	if err := repo_service.DeleteRepository(ctx.User, repo); err != nil {
 		ctx.Error(http.StatusInternalServerError, "DeleteRepository", err)
 		return