[Issue] Too many database calls during warmup cache

[gabrielmustiere]

Sylius version affected: 1.12

Description
During cache:warmup and specifically during TemplateCacheWarmer, Sylius tries to connect to the database manytime by template file to load a channel to retrieve a theme.

There are long timeouts when the database is inaccessible, which is my case when I'm building the application with docker in a gitlab job.

Steps to reproduce
Cache clear when database inaccessible