schema: add definition for exoscale
"aws",
"azure",
"dasd",
+ "exoscale",
"gcp",
"initramfs",
"iso",
"title":"dasd",
"$ref": "#/definitions/artifact"
},
+ "exoscale": {
+ "$id":"#/properties/images/properties/exoscale",
+ "type":"object",
+ "title":"exoscale",
+ "$ref": "#/definitions/artifact"
+ },
"qemu": {
"$id":"#/properties/images/properties/qemu",
"type":"object",
