We can use PHP, NodeJS, Go, and more.
But my favorite language is not there. How do I add a new language (e.g. Erlang, Elixir, …) ?
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If Platform.sh does not currently a runtime container for your language, you will have to install it during the build hook inside your .platform.app.yaml file.
A good example of how you can do this has been published as a How-to for deploying a Rust application on Platform.sh. Pay special attention to the build hook Step 2 and modify accordingly for your language.