nix: replace deprecated `pkgs.system` with `stdenv.hostPlatform.system` #6509

	---
	name: Cargo Native

	on:
	push:
	branches: [main]
	paths-ignore:
	- '.github/styles/**'
	- 'web/**'
	pull_request:
	branches: [main]
	paths-ignore:
	- '.github/styles/**'
	- 'web/**'

	permissions: read-all

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}

	env:
	RUSTFLAGS: -Dwarnings

	jobs:
	cargo-native:
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-24.04, windows-2022]
	toolchain: [stable]
	name: ${{ matrix.os }} / ${{ matrix.toolchain }}
	runs-on: ${{ matrix.os }}
	timeout-minutes: 30
	steps:
	- name: Checkout
	uses: >- # v6.0.2
	actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd

	# Ubuntu 24.04 restricts unprivileged user namespaces by default, which breaks
	# the worker tests that use namespaces (e.g. for sandboxing).
	- name: Disable AppArmor namespace restrictions
	run: sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
	if: matrix.os == 'ubuntu-24.04'

	- name: Set up Rust toolchain
	run: rustup update && rustup default ${{ matrix.toolchain }}
	shell: bash

	- name: Rust cache
	# https://github.com/Swatinem/rust-cache/releases/tag/v2.9.1
	uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4

	- name: Build on ${{ runner.os }}
	run: cargo build --all --profile=smol

	- name: Test on ${{ runner.os }}
	run: cargo test --all --profile=smol

	- name: Check schema export
	run: cargo run --bin build-schema --features dev-schema --package nativelink-config

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