tasks.json

{
	"version": "2.0.0",
	"tasks": [
    {
      "type": "gulp",
      "label": "gulp watch",
      "task": "watch",
      "problemMatcher": [],
      "group": {
        "kind": "build",
        "isDefault": true
      },
      "presentation": {
        "echo": true,
        "reveal": "silent",
        "focus": false,
        "panel": "shared",
        "showReuseMessage": true,
        "clear": false
      },
      "runOptions": {
        "runOn": "folderOpen"
      }
    },
    {
      "type": "shell",
      "label": "bundle install",
      "command": "bundle install",
      "problemMatcher": []
    },
    {
      "type": "shell",
      "label": "bundle serve",
      "command": "bundle exec jekyll serve --host 0.0.0.0 --port 4000 --config _config.yml",
      "problemMatcher": []
    },
    {
      "type": "shell",
      "label": "bundle serve developer",
      "command": "bundle exec jekyll serve --host 0.0.0.0 --port 4000 --config _config.yml,_developer.yml",
      "problemMatcher": [],
      "runOptions": {
        "runOn": "folderOpen"
      }
    }
  ]
}