Write user config to nix.custom.conf, defer nix.conf to determinate when using determinate #2602

Set up job

Set up runner

Run actions/checkout@v4

Restore Github cache artifacts

Move & set executable

Run sudo apt install -y fish zsh

Initial install

Validate dnixd is uninstalled

Initial uninstall (without a `nix run` first)

Ensure `nix` is removed

Repeated install

echo $PATH

Test `nix` with `$GITHUB_PATH`

46s

Test bash

Test sh

Test zsh

Test fish

Repeated uninstall

Ensure `nix` is removed

Post Repeated install

Post Initial install

Post Run actions/checkout@v4

Complete job

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