Getting document ID when decoding firestore document using Swift Codable

I'm using a class to decode retrieved firestore documents, and it works as expected if I don't want to manipulate the data:

class Room: Identifiable, Codable {

    @DocumentID public var id:String?
    var name:String

}

However if I try to use my own init to set values, I can't get the firestore document ID?

class Room: Identifiable, Codable {

    @DocumentID public var id:String?
    var name:String
    
    
    enum Keys:String, CodingKey {
        case name
        case capacity
        case photo = "url"
    }
    
    required init(from decoder: Decoder) throws {

        // How do I get the document ID to set the id value?

        let container = try decoder.container(keyedBy: Keys.self)
        name = try container.decode(String.self, forKey: .name)
        capacity = try container.decode(Int.self, forKey: .capacity)
        photo = try container.decode(String.self, forKey: .photo)

        // Do some more stuff here...
    }
}