Give all containers a display_name, hide from list by dedicated attribute

We want a display-name for all containers in the overlay-log, but still want
to exclude some containers from the list on top of the web UI.

Signed-off-by: Pablo Zmdl <pablo@nextcloud.com>

php/containers-schema.json

@@ -49,6 +49,9 @@
 						"type": "string",
 						"pattern": "^[()A-Za-z &0-9-]+$"
 					},
+					"hide_from_list": {
+						"type": "boolean"
+					},
 					"environment": {
 						"type": "array",
 						"items": {
@@ -229,4 +232,4 @@
 			}
 		}
 	}
-}
+}}