Add ping support to fpm for health checks

[andypost]

Also would be great to make it configurable
https://github.com/wodby/php/blob/master/7/templates/zz-www.conf.tmpl#L28

https://github.com/wodby/php/search?q=health&type=Commits

[andypost]

Looks we have to add it to use k8s, the script is https://github.com/renatomefi/php-fpm-healthcheck#enable-php-fpm-status-page

[andypost]

For nginx unit it could use curl

/var/www/html/web # curl --unix-socket /run/control.unit.sock http://localhost/status/applications/drupal/processes/running
1
var/www/html/web # curl --unix-socket /run/control.unit.sock http://localhost/status/
{
	"connections": {
		"accepted": 2,
		"active": 0,
		"idle": 0,
		"closed": 2
	},

	"requests": {
		"total": 2
	},

	"applications": {
		"drupal": {
			"processes": {
				"running": 1,
				"starting": 0,
				"idle": 1
			},

			"requests": {
				"active": 0
			}
		}
	}
}

[andypost]

to wait for postgresql better to use vendor/bin/drush sqlq "SELECT 1" so it

• Drupal configured and can find database connection
• DB is active and can execute queries