packages/nixos: minimize image size #1066
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Our images are immutable and thus don't need the Nix CLI and daemon, which - by design - can only work in a mutable system. This saves 188MB in image size
This removes Perl and Python dependencies from our NixOS images. These are used throughout scripts for user generation and setup of volatile directories at boot (like `/etc`). However, this functionality can also be implemented without those interpreters, allowing us to remove them from the system closure. This saves around 168MB in image size.
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Previously, our bare-metal Kata image weighed in at around 838MB. This PR reduces its size to about 561MB. It does so by incorporating the following changes:
/etc, which traditionally was implemented in Perl, but now has an overlayfs-based alternative for available. This saves around 90MB in image size.Minimizations for the GPU-enabled image are intentionally deferred to be implemented in a follow-up PR.