Add template for Backrest

[maelp]

What problem will this feature address?

Basic template for backup service Backrest to add to the app templates

version: "3.8"

services:
  backrest:
    image: garethgeorge/backrest:v1.7.3
    container_name: backrest
    hostname: backrest
    restart: unless-stopped
    ports:
      - "9898:9898"
    environment:
      - BACKREST_PORT=9898
      - BACKREST_DATA=/data
      - BACKREST_CONFIG=/config/config.json
      - XDG_CACHE_HOME=/cache
      - TZ=America/Los_Angeles
    volumes:
      - /mnt/data/backrest/data:/data
      - /mnt/data/backrest/config:/config
      - /opt/backrest/cache:/cache
      - /mnt/data:/userdata:ro # we mount /mnt/data (or whatever folder you want) to /userdata (that we want to backup)

Describe the solution you'd like

Add a template

Describe alternatives you've considered

Do it manually

Additional context

Could be interesting to have default backups for Docker volumes and/or a /mnt/data disk for dokploy (this is where I store all the data for my containers, I find it "safer" than docker volumes which are a bit less easy to look at and manage)

Will you send a PR to implement it?

Maybe, need help