Async Symfony Messenger

[k-37]

This is proposal to fix issue #539 based on my interpretation of conversation in the issue.

[7-zete-7]

Suggested change

	```yaml
	php-worker:
	image: ${IMAGES_PREFIX:-}app-php-worker
	restart: unless-stopped
	environment:
	- RUN_MIGRATIONS=false
	healthcheck:
	disable: true
	depends_on:
	- php
	```
	```yaml
	php-worker:
	image: ${IMAGES_PREFIX:-}app-php-worker
	restart: unless-stopped
	environment:
	- RUN_MIGRATIONS=false
	healthcheck:
	disable: true
	depends_on:
	- php

[7-zete-7]

Suggested change

	```yaml
	php-worker:
	build:
	context: .
	target: frankenphp_prod
	environment:
	APP_SECRET: ${APP_SECRET}
	```
	```yaml
	php-worker:
	build:
	context: .
	target: frankenphp_prod
	environment:
	APP_SECRET: ${APP_SECRET}

[7-zete-7]

Maybe combine these lines into one?

Suggested change

	+ run_migrations=${RUN_MIGRATIONS:-true}
	+ if grep -q ^DATABASE_URL= .env && [ "$run_migrations" = "true" ]; then
	+ if grep -q ^DATABASE_URL= .env && [ "${RUN_MIGRATIONS:-true}" = "true" ]; then

[7-zete-7]

Great work, @k-37!

Do you think it makes sense to create a new entrypoint for the php-worker service, so that the --time-limit, --limit and --memory-limit parameters can be set via environment variables, and transports (and additional parameters) via the command parameter?

   php-worker:
     # ...
     environment:
       - RUN_MIGRATIONS=false
       - CONSUMER_TIME_LIMIT=60
       - CONSUMER_LIMIT=10
       - CONSUMER_MEMORY_LIMIT=128M
     command: ['async']