borbackup-static: impl

Implements sane defaults implementing borgbackup

Fixes: #1551

clanModules/flake-module.nix

@@ -5,6 +5,7 @@
       imports = [ ./disk-layouts ];
     };
     borgbackup = ./borgbackup;
+    borgbackup-static = ./borgbackup-static;
     deltachat = ./deltachat;
     ergochat = ./ergochat;
     localbackup = ./localbackup;