.devcontainer/devcontainer.json

{
    // The name of the dev container
    "name": "Focal",

    // The Dockerfile to use for building the dev container
    "dockerFile": "../Dockerfile",

    // This is the key setting to prevent VS Code from overriding your CMD.
    // Setting it to 'false' ensures your Dockerfile's CMD command is respected.
    "overrideCommand": false,

    "runArgs": [
        "--env-file",
        ".env"
    ],

    // Any ports to forward from the container to your local machine
    "forwardPorts": [7860],

    // Extensions to install in the container
    "customizations": {
        "vscode": {
            "extensions": [
                "ms-python.python",
                "ms-python.vscode-pylance"
            ]
        }
    }
}