symfony/webapp-pack defines a MESSENGER_TRANSPORT_DSN

[lyrixx]

https://github.com/symfony/recipes/blob/b3395a2477b6d58089f92ef3a0d2e58226825a3a/symfony/webapp-pack/1.0/manifest.json#L7

First, this is a bit weird, but moreover this conflicts with symfony/messenger.

symfony new --webapp generates the following files

# In all environments, the following files are loaded if they exist,
# the latter taking precedence over the former:
#
#  * .env                contains default values for the environment variables needed by the app
#  * .env.local          uncommitted file with local overrides
#  * .env.$APP_ENV       committed environment-specific defaults
#  * .env.$APP_ENV.local uncommitted environment-specific overrides
#
# Real environment variables win over .env files.
#
# DO NOT DEFINE PRODUCTION SECRETS IN THIS FILE NOR IN ANY OTHER COMMITTED FILES.
# https://symfony.com/doc/current/configuration/secrets.html
#
# Run "composer dump-env prod" to compile .env files for production use (requires symfony/flex >=1.2).
# https://symfony.com/doc/current/best_practices.html#use-environment-variables-for-infrastructure-configuration

###> symfony/framework-bundle ###
APP_ENV=dev
APP_SECRET=adea3499ae133cf82f1599794754e256
###< symfony/framework-bundle ###

###> symfony/webapp-pack ###
MESSENGER_TRANSPORT_DSN=doctrine://default?auto_setup=0
###< symfony/webapp-pack ###

###> doctrine/doctrine-bundle ###
# Format described at https://www.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html#connecting-using-a-url
# IMPORTANT: You MUST configure your server version, either here or in config/packages/doctrine.yaml
#
# DATABASE_URL="sqlite:///%kernel.project_dir%/var/data.db"
# DATABASE_URL="mysql://app:[email protected]:3306/app?serverVersion=8&charset=utf8mb4"
DATABASE_URL="postgresql://app:[email protected]:5432/app?serverVersion=14&charset=utf8"
###< doctrine/doctrine-bundle ###

###> symfony/messenger ###
# Choose one of the transports below
# MESSENGER_TRANSPORT_DSN=doctrine://default
# MESSENGER_TRANSPORT_DSN=amqp://guest:guest@localhost:5672/%2f/messages
# MESSENGER_TRANSPORT_DSN=redis://localhost:6379/messages
###< symfony/messenger ###

###> symfony/mailer ###
# MAILER_DSN=null://null
###< symfony/mailer ###

As you can see, there is two sections where MESSENGER_TRANSPORT_DSN is defined.

Finally, the version uncommented is in symfony/webapp-pack.