microvm-host: add syntax highlighting

modules/microvm-host.nix

@@ -42,7 +42,7 @@
         };
         path = with pkgs; [ zfs ];
         scriptArgs = "%i";
-        script = ''
+        script = /* bash */ ''
           zfsExists() {
             zfs list $1 >/dev/null 2>/dev/null
           }
@@ -74,7 +74,7 @@
     environment.systemPackages = [ (
       # Provide a manual updating script that fetches the latest
       # updated+built system from Hydra
-      pkgs.writeScriptBin "update-microvm" ''
+      pkgs.writeScriptBin "update-microvm" /* bash */ ''
         #! ${pkgs.runtimeShell} -e
 
         if [ $# -lt 1 ]; then