hometown/.devcontainer/devcontainer.json

{
  "name": "Mastodon on local machine",
  "dockerComposeFile": "docker-compose.yml",
  "service": "app",
  "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",

  "features": {
    "ghcr.io/devcontainers/features/sshd:1": {}
  },

  "forwardPorts": [3000, 4000],

  "portsAttributes": {
    "3000": {
      "label": "web",
      "onAutoForward": "notify",
      "requireLocalPort": true
    },
    "4000": {
      "label": "stream",
      "onAutoForward": "silent",
      "requireLocalPort": true
    }
  },

  "otherPortsAttributes": {
    "onAutoForward": "silent"
  },

  "onCreateCommand": "git config --global --add safe.directory ${containerWorkspaceFolder}",
  "postCreateCommand": ".devcontainer/post-create.sh",
  "waitFor": "postCreateCommand",

  "customizations": {
    "vscode": {
      "settings": {},
      "extensions": ["EditorConfig.EditorConfig", "webben.browserslist"]
    }
  }
}