PHPDocker.io - PHP 7.0 / FPM container image
Smaller in size than PHP's official container (170MB vs 501MB) plus you don't need to install any build dependencies let alone compile anything, Dotdeb already ship binaries for the vast majority, if not all, of PHP extensions available on PHP7.
Note on logging: configure your application to stream logs into
php://stdout. That's it. We do some trickery to remove FPM's
[pool www] child xxx said into stderr messages from stdout when an app outputs to it.