VS Code tasks.json with custom shell configured

tasks.json

{
  // See https://go.microsoft.com/fwlink/?LinkId=733558
  // for the documentation about the tasks.json format
  "version": "2.0.0",
  "options": {
    "shell": {
      "executable": "/usr/local/bin/zsh",
      "args": ["-l", "-c"]
    }
  },
  "tasks": [
    {
      "label": "check env",
      "type": "shell",
      "command": "env",
      "problemMatcher": []
    },
    {
      "label": "check ruby version",
      "type": "shell",
      "command": "echo `ruby -v`",
      "problemMatcher": []
    },
    {
      "label": "test all",
      "type": "shell",
      "command": "bin/rspec spec/**/*_spec.rb",
      "problemMatcher": [],
      "group": "test",
      "presentation": {
        "reveal": "always",
        "focus": true
      }
    },
    {
      "label": "test current file",
      "type": "shell",
      "command": "bin/rspec ${relativeFile}",
      "problemMatcher": [],
      "group": "test",
      "presentation": {
        "reveal": "always",
        "focus": true
      }
    },
    {
      "label": "test current line",
      "type": "shell",
      "command": "bin/rspec ${relativeFile}:${lineNumber}",
      "problemMatcher": [],
      "group": "test",
      "presentation": {
        "reveal": "always",
        "focus": true
      }
    },
    {
      "label": "rubocop format",
      "type": "shell",
      "command": "rubocop -a ${relativeFile}",
      "problemMatcher": [],
      "group": "build",
      "presentation": {
        "reveal": "always"
      }
    }
  ]
}