Cache nix

.forgejo/install-emacs/install-nix.sh

@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# Sudo is required by this installer
+apt-get update -qq
+apt-get install -y sudo
+
 if nix_path="$(type -p nix)" ; then
   echo "Aborting: Nix is already installed at ${nix_path}"
   exit
@@ -79,8 +83,6 @@ else
   # "fix" the following error when running nix*
   # error: the group 'nixbld' specified in 'build-users-group' does not exist
   add_config "build-users-group ="
-  apt-get update -qq
-  apt-get install -y sudo
   sudo mkdir -p /etc/nix
   sudo chmod 0755 /etc/nix
   sudo cp "$workdir/nix.conf" /etc/nix/nix.conf