It uses php-fpm, which supposedly helps with server load and thus might help with our downtime. (I tried to use the official wordpress-php-fpm image but it doesn't seem to work out of the box; it needs to be combined with nginx.)
It installs the WordPress CLI, which would make it easier to install plugins like #8 requests.
https://github.com/bitnami/bitnami-docker-wordpress-nginx
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