porada/middleman-autoprefixer

{
    "name": "Ruby",
    "build": {
        "dockerfile": "Dockerfile",
        "args": { 
            // Update 'VARIANT' to pick a Ruby version: 2, 2.7, 2.6, 2.5
            "VARIANT": "2",
            // Options
            "INSTALL_NODE": "true",
            "NODE_VERSION": "lts/*"
        }
    },

    // Set *default* container specific settings.json values on container create.
    "settings": { 
        "terminal.integrated.shell.linux": "/bin/bash"
    },

    // Add the IDs of extensions you want installed when the container is created.
    "extensions": [
        "rebornix.Ruby"
    ]
    
    // Use 'forwardPorts' to make a list of ports inside the container available locally.
    // "forwardPorts": [],

    // Use 'postCreateCommand' to run commands after the container is created.
    // "postCreateCommand": "ruby --version",

    // Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
    // "remoteUser": "vscode"

}