Make Nix install non-interactive in CI

Author: DJTBOT

.github/workflows/docker-image.yml

@@ -21,7 +21,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          curl -fsSL https://install.determinate.systems/nix | sh -s -- install
+          curl -fsSL https://install.determinate.systems/nix | sh -s -- install --no-confirm
           . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
           nix --version