[UPGRADE] Limit the size allocated to the Nextcloud container #1

The Nextcloud container currently has no limitation of memory. That means it can grow up too the server capacity. In that extreme case, the other containers won't have enough free memory to run.
This situation leads to a global black out of all the containers.

IDEA#1: to have a parameter in the compose.yml file in order to give a limitation to the Nextcloud container. This parameter can be:

a percentage of the total memory of the server
OR a fixed value (ie: 15G0)

IDEA#2: generalize this parameter to all the containers (Odoo, Rocketchat,...)

Nice idea. Please note that you can already do those things (well most of them).

Indeed, docker-compose value in yaml allow you to pass on docker-compose options... and these exist already:

https://docs.docker.com/compose/compose-file/compose-file-v2/#cpu-and-other-resources

and for units and all:
https://docs.docker.com/engine/reference/run/#runtime-constraints-on-resources

Just keep in mind the docker-compose.yml generated is currently version 2.

Depending if we want to add some level of abstraction to these notions, we can think about adding a specific options right in 0k-compose.

For now here an example of how you can achieve this in your compose.yml:

nexcloud:
  ...
  docker-compose:
    mem_limit: 1g

If you have a general feeling of how resources should always be attributed, or at least decided charm by charm. I could automatically then generate these limit by following your rule.

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