ensure we run Composer 1 for test setups etc
ensure we run Composer 1 for test setups etc

otherwise we'll generate e.g. v2 locks for HHVM etc

emeth-/heroku-buildpack-php,emeth-/heroku-buildpack-php,emeth-/heroku-buildpack-php,heroku/heroku-buildpack-php,heroku/heroku-buildpack-php,emeth-/heroku-buildpack-php,heroku/heroku-buildpack-php,heroku/heroku-buildpack-php