forum/docs/build.md

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# Build Options
## Selecting a Specific Symfony Version
Use the `SYMFONY_VERSION` environment variable to select a specific Symfony version.
For instance, use the following command to install Symfony 4.4:
$ SYMFONY_VERSION=4.4.* docker-compose up --build
To install a non-stable version of Symfony, use the `STABILITY` environment variable during the build.
The value must be [a valid Composer stability option](https://getcomposer.org/doc/04-schema.md#minimum-stability)) .
For instance, use the following command to use the `master` branch of Symfony:
$ STABILITY=dev docker-compose up --build
## Customizing the Server Name
Use the `SERVER_NAME` environment variable to define your custom server name(s).
$ SERVER_NAME="symfony.wip, caddy:80" docker-compose up --build
If you use Mercure, keep `caddy:80` in the list to allow the PHP container to request the caddy service.