Containers: make opening a container from Dockerfile a nice experience

Occasionally I need to test something in VSCode's docker container for Linux that we use for building VSCode: https://github.com/microsoft/vscode-linux-build-agent/tree/master/x64

That is the moment when I am using the Remote Container and Docker extension. The flow I want is the following: given a Dockerfile, allow me to open a local folder on my OS inside that docker file. This should be a one-click command that does:

• create an image
• create a container
• start the container
• opens a folder I choose in that container in a VSCode instance

Today this is not possible, the steps are:

• right-click Dockerfile -> create image
• open a terminal and run the image so that it becomes a container to connect to (it needs to run a long running command to not shutdown directly)
• right click container -> open folder in container