async function getEnvPhpVersion( envPath ) {
	const dockerCompose = path.join( envPath, 'docker-compose.yml' );
	const yaml = readYaml( dockerCompose );
	const phpVersion = yaml.services.phpfpm.image.split( ':' ).pop();
	return phpVersion.split( '-' ).shift();
}
Gets the PHP version of an env from the docker-compose.yml.

@param {string} envPath path to the environemt
@return string php version