forum/docs/build.md

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) .

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.

$ SERVER_NAME=symfony.wip docker-compose up --build