You can use docker with it - I have a couple of things with "docker run" statements in the procfile, but of course it’s not designed for that.
Most of the deployments I got wind of are on extremely stable distros - typically LTS versions where you will not need to upgrade your runtime every six months (and my website has been running in it for at least two Ubuntu LTS releases…)
But you can trivially use pyenv/nvenv/etc. by just setting environment variables. My home automation system now needs two different Node versions, and I have one set per app.
Most of the deployments I got wind of are on extremely stable distros - typically LTS versions where you will not need to upgrade your runtime every six months (and my website has been running in it for at least two Ubuntu LTS releases…)
But you can trivially use pyenv/nvenv/etc. by just setting environment variables. My home automation system now needs two different Node versions, and I have one set per app.