ci: Bump Nix to 2.18.1 #974
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Change `CI_NIX_INSTALL_URL` to point to Nix 2.18.1. This should not break anything, because the old `cpcloud/flake-update-action` should still be compatible with that version, and the `nix-build-uncached` package in the locked `nixpkgs` input (NixOS 23.11) is updated for compatibility with Nix >= 2.15. Note that the input of `nix-build-uncached` does not need to have the `^*` suffixes added to `*.drv` paths, because that input is passed to `nix-build`, which did not have incompatible changes in Nix 2.15 (the changes were made to `nix build`, which is used internally by `nix-build-uncached` after getting the list of derivations that needs to be built from `nix-build --dry-run`).
By default `nix flake check` skips systems which are incompatible with the host; add the `--all-systems` option to check evaluations for all supported systems.
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Nix 2.18.1 is the stable release used by NixOS 23.11; it is also the last release which still uses the old syntax for the
nix flake lock --update-input <dependency>command (see cpcloud/flake-update-action#227; although the compatibility should be restored in Nix 2.19.2, that version also prints deprecation warnings for the old syntax).This may also fix some random CI failures on MacOS (NixOS/nix#8049 was merged in Nix 2.15.0, but that version was not used due to compatibility issues with
nix-build-uncached, which were apparently fixed).