Fix: added missing quotes to max-file in docker-compose.yml

[drumlinish]

The quotes fixes the error bellow:

$ docker-compose up -d
Creating network "docker_default" with the default driver
Creating docker_pictrs_1   ... error
Creating docker_postgres_1 ... 

ERROR: for docker_pictrs_1  Cannot create container for service pictrs: invalid JSON: json: cannot unmarshal number into Go struct field LogConfig.HostConfig.LogConfig.Config oCreating docker_postgres_1 ... error

ERROR: for docker_postgres_1  Cannot create container for service postgres: invalid JSON: json: cannot unmarshal number into Go struct field LogConfig.HostConfig.LogConfig.Config of type string

ERROR: for pictrs  Cannot create container for service pictrs: invalid JSON: json: cannot unmarshal number into Go struct field LogConfig.HostConfig.LogConfig.Config of type string

ERROR: for postgres  Cannot create container for service postgres: invalid JSON: json: cannot unmarshal number into Go struct field LogConfig.HostConfig.LogConfig.Config of type string
ERROR: Encountered errors while bringing up the project.

Testet with docker-compose version 1.29.2.

Note: The value is already in quotes in https://github.com/LemmyNet/lemmy-ansible/blob/main/templates/docker-compose.yml