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I think the author doesn't mention why they've gone down this path at all and assumed it's self evident. There was nothing I could clean except for your conclus

I think the author doesn't mention why they've gone down this path at all and assumed it's self evident. There was nothing I could clean except for your conclusion, which is the standard way of building images. Just use the official docker image for that node version. Nvm is not a build tool.

SOLAR_FIELDS 3y ago
If you want to only build and maintain a single runner image that works for multiple projects in your organization you would be interested in doing something like this. Why? Some generic CI/CD setups are simplified if you share a single runner image. One example that I’m using is actions-runner-controller. It wants to use a single image per instance, and it’s simpler/easier to manage one installation of actions-runner-controller. Maintaining security and dependencies is easier for a single image as well.
- ehutch79 3y ago
  This feels weird. Unless you're running that image in production as well? Thats sort of the point? Production matches the test environment. It's still early here, it's very possible I'm not really with it at the moment