astro/.devcontainer/framework-multiple/devcontainer.json

{
    "name": "Astro Examples",
    "build": {
      "dockerfile": "../examples.Dockerfile"
    },

    "workspaceFolder": "/workspaces/astro/examples/framework-multiple",

    "portsAttributes": {
      "3000": {
        "label": "Application",
        "onAutoForward": "openPreview"
      }
    },
  
    "forwardPorts": [3000],
  
    "postCreateCommand": "pnpm install && cd /workspaces/astro && pnpm run build",
  
    "waitFor": "postCreateCommand",
  
    "postAttachCommand": {
      "Server": "pnpm start --host"
    },
  
    "customizations": {
      "codespaces": {
        "openFiles": [
          "src/pages/index.astro"
        ]
      },
      "vscode": {
        "extensions": [
          "astro-build.astro-vscode",
          "esbenp.prettier-vscode"
        ]
      }
    }
  }