add additional data to return payload for http check

[shreddedbacon]

Currently only "found": true is returned if a provider is found. It would be useful to provide additional information here upfront so that lagoon builds can consume this data if required (mainly the readreplica support)

{
	"found": true,
	"providers": [
	{
		"name": "provider1",
		"readReplicas": true|false
	},
	{
		"name": "provider2",
		"readReplicas": true|false
	}]
}