VSCodeでリモート接続してDockerコンテナ上で作業するときのワークスペース設定箇所

VSCodeからDockerコンテナにリモート接続して作業する際、毎回 /にマウントされてしまっていて困っていた。
.devcontainerディレクトリのdevcontainer.jsonを見たらworkspaceFolderという箇所があった

.devcontainer/devcontainer.json

// For format details, see https://aka.ms/vscode-remote/devcontainer.json or this file's README at:
// https://github.com/microsoft/vscode-dev-containers/tree/v0.134.1/containers/docker-existing-docker-compose
// If you want to run as a non-root user in the container, see .devcontainer/docker-compose.yml.
{
	"name": "Existing Docker Compose (Extend)",

	// Update the 'dockerComposeFile' list if you have more compose files or use different names.
	// The .devcontainer/docker-compose.yml file contains any overrides you need/want to make.
	"dockerComposeFile": [
		"../docker-compose.yml",
	],

	// The 'service' property is the name of the service for the container that VS Code should
	// use. Update this value and .devcontainer/docker-compose.yml to the real service name.
	"service": "go_app",

	// The optional 'workspaceFolder' property is the path VS Code should open by default when
	// connected. This is typically a file mount in .devcontainer/docker-compose.yml
    // ここ
	"workspaceFolder": "/go/src/work",

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

	// Add the IDs of extensions you want installed when the container is created.
	"extensions": []

	// Use 'forwardPorts' to make a list of ports inside the container available locally.
	// "forwardPorts": [],

	// Uncomment the next line if you want start specific services in your Docker Compose config.
	// "runServices": [],

	// Uncomment the next line if you want to keep your containers running after VS Code shuts down.
	// "shutdownAction": "none",

	// Uncomment the next line to run commands after the container is created - for example installing curl.
	// "postCreateCommand": "apt-get update && apt-get install -y curl",

	// Uncomment to connect as a non-root user if you've added one. See https://aka.ms/vscode-remote/containers/non-root.
	// "remoteUser": "vscode"
}

設定ファイル見るのと英語読むの大事