add support for a local vagrant.settings.yml

this allows to configure some settings per-machine
for now cpu and ram of the wings vm

.gitignore

@@ -3,3 +3,6 @@
 .data/**
 .docker-sync/**
 .idea
+
+# intended for per-machine config
+vagrant.config.yml

Vagrantfile

@@ -1,3 +1,6 @@
+require 'yaml'
+require 'pathname'
+
 ["vagrant-vbguest", "vagrant-hostmanager"].each do |plugin|
     unless Vagrant.has_plugin?(plugin)
       raise plugin + " plugin is not installed. Hint: vagrant plugin install " + plugin
@@ -6,6 +9,11 @@ end
 
 vagrant_root = File.dirname(__FILE__)
 
+$configMap = FileTest.exist?("#{vagrant_root}/vagrant.config.yml") ? YAML.load_file("#{vagrant_root}/vagrant.config.yml") : {}
+def config(key, def_val)
+  return $configMap.dig(*key.split(".")) || def_val
+end
+
 Vagrant.configure("2") do |config|
 	config.hostmanager.enabled = false
 	config.hostmanager.manage_host = true
@@ -76,8 +84,8 @@ Vagrant.configure("2") do |config|
 		wings.vm.box = "bento/ubuntu-18.04"
 
         wings.vm.provider "virtualbox" do |v|
-            v.memory = 2048
-            v.cpus = 2
+            v.memory = config("wings.memory", 2048)
+            v.cpus = config("wings.cpus", 2)
             v.customize ["modifyvm", :id, "--cpuexecutioncap", "75"]
         end