[SymfonyCloud] Install Blackfire up-to-date probe and agent manually

.symfony.cloud.yaml

# A unique name for this application
name: 'my-app'

# The language and version to use
type: 'php:7.4'

runtime:
    extensions:
        - apcu
        - redis
        - pdo_pgsql
        # DO NOT ADD blackfire extension here

variables:
    php:
        # This extension is being downloaded and extracted in the build hook
        extension: /app/blackfire-20190902-zts.so
hooks:
    build: | # container is read/write access - no access to shared folders - no access to services
        set -x -e

        curl -s https://get.symfony.com/cloud/configurator | (>&2 bash)
        
        # Download and extract the Blackfire Probe
        wget https://blackfire.io/api/v1/releases/probe/php/linux/amd64/74-zts -O blackfire-php.tar.gz
        tar xzf blackfire-php.tar.gz
        
        # Download and extract the Blackfire Agent
        wget https://blackfire.io/api/v1/releases/agent/linux/amd64 -O blackfire-agent.tar.gz
        tar xzf blackfire-agent.tar.gz && mv agent /app/.global/bin/blackfire-agent
        rm blackfire-agent.tar.gz
        
        # Installing blackfire-player
        (
            mkdir -p ${SYMFONY_CACHE_DIR}/blackfire
            cd ${SYMFONY_CACHE_DIR}/blackfire
            wget -N https://get.blackfire.io/blackfire-player.phar
            chmod +x blackfire-player.phar
            cp blackfire-player.phar /app/.global/bin/blackfire-player
        )

        (>&2 env symfony-build)
        (>&2 composer dump-env prod)
 
    deploy: |
        set -x -e
        (>&2 symfony-deploy)