Always log Runner and Environment ID.

Systematically log the runner id and the environment id by adding the information at the findRunnerMiddleware.

pkg/dto/dto.go

@@ -184,6 +184,12 @@ func (f File) ByteContent() []byte {
 // ContextKey is the type for keys in a request context that is used for passing data to the next handler.
 type ContextKey string
 
+// Keys to reference information (for logging or monitoring).
+const (
+	KeyRunnerID      = "runner_id"
+	KeyEnvironmentID = "environment_id"
+)
+
 // WebSocketMessageType is the type for the messages from Poseidon to the client.
 type WebSocketMessageType string