[Feature]: Ephemeral Devbox

[rbelem]

Is your feature request related to a problem you're trying to solve? Please describe.

Occasionally, I need to install an app for testing purposes or to perform a one-time task.

Describe the solution you'd like

I would like an ephemeral devbox that would install the packages from the args and forget about it after exiting.

Describe alternatives you've considered

Today I have to install the app to the devbox global and then remove it after I'm done using it.

Additional context
@mikenikles created an alias that sets up a temporary devbox project for his use.

alias env-node="mkdir .devbox-tmp && cd .devbox-tmp && devbox init && devbox add nodejs-18_x && cd - && devbox shell --config .devbox-tmp && rm -fr .devbox-tmp"