Use common script for Arch installation

profiles/machines/manuel/DerGeret/Arch/setup.fish

@@ -2,10 +2,6 @@
 begin
     set -l dir (status dirname)
 
-    function getInstallerScript -V dir -S
-        echo "$dir/install.fish"
-    end
-
     CONFIG_NAME="DerGeret" \
     ARCH_HOSTNAME="der-geret" \
     USER_DISPLAYNAME="Manuel Thalmann" \

scripts/Arch/OS/setup.fish

@@ -14,6 +14,10 @@ begin
         pacstrap -K "$mountDir" fish jq nix tmux
     end
 
+    function getInstallerScript -V dir -S
+        echo "$dir/install.fish"
+    end
+
     function setupOS -S -V dir -V mountDir
         source "$dir/../../Common/Scripts/hooks.fish"
         source "$dir/../../Common/Scripts/wait-network.fish"