Fix keep-derivations step

Author: nathom

.github/workflows/release.yml

@@ -39,14 +39,11 @@ jobs:
         run: |
           set -euo pipefail
           sudo mkdir -p /etc/nix
-          while read -r line; do
+          for line in "keep-outputs = true" "keep-derivations = true"; do
             if ! grep -qF "$line" /etc/nix/nix.conf 2>/dev/null; then
               echo "$line" | sudo tee -a /etc/nix/nix.conf >/dev/null
             fi
-          done <<'EOF'
-keep-outputs = true
-keep-derivations = true
-EOF
+          done
           sudo systemctl restart nix-daemon || true
 
       - name: Enable Nix cache